- Freezing jams and preserves is a process of preserving by storing them in the freezer at a temperature just above freezing.
- This prevents the mixture from spoiling and microbes from attacking it.
- To freeze jam, place it in an air-tight container and place the container in the freezer.
- Once frozen, keep it in the freezer for up to 3 months without any worries about spoilage or quality loss.
Table of Contents
- Second Answer
- Can homemade jam be frozen?
- Can I store jam in freezer?
- Is it OK to freeze jam in glass jars?
- How long does homemade jam last in the freezer?
- How do you defrost frozen jam?
- Can you freeze jam in plastic containers?
- Why is my freezer jam separating?
- How long will jam Keep in refrigerator?
- Why is my freezer jam cloudy?
- What containers can I use for freezer jam?
- How long does homemade jam last in fridge?
- How do you store homemade jam?
- Can you freeze jam without pectin?
- How do you know if homemade jam is bad?
- Do you need to sterilize jars for jam?
- Why is jam stored in glass jars?
- Do you have to seal freezer jam?
- Why is the fruit floating in my jam?
- Why did my strawberry jam turn brown?
- How can I thicken jam without pectin?
- How do you preserve jam?
- Is runny jam safe to eat?
- Can you eat jam straight away?
- Why is my freezer jam gritty?
- How do you keep jam from crystallizing?
- Do you seal jam jars when hot?
- Can I put freezer jam in Tupperware?
- Can I use freezer jam pectin for cooked jam?
- How do I know if my freezer jam is set?
- Can I make jam and can it later?
- Will jam go bad if not refrigerated?
- Do you have to can homemade jam?
- Why do you add lemon juice to jam?
- Can you use jam without a canner?
- Does homemade jam have to be refrigerated?
- Why is pectin bad for you?
- Why is pectin used in jam?
- Do you wash fruit before making jam?
- Can botulism grow in homemade jam?
- How long does homemade jam last without pectin?
- Is mold on jam harmful?
- Do you let jam cool before putting lids on?
- What happens if you don’t sterilize canning jars?
- Can you use Milton to Sterilise jam jars?
In most cases, jams are processed in a hot-water bath to keep them from spoiling. However, this may not be necessary with frozen jams because the freezing process will prevent spoilage without boiling. After completing the hot-water processing, one may then pour the jam into pint or quart freezer containers and put it in the freezer for up to six months.
Check out Can I Freeze A Rotisserie Chicken?
Can homemade jam be frozen?
In order for jam to be frozen it must be processed. Without the processing, the jam will become a gel and then a liquid when thawed.
Homemade jam can be frozen, but it is best to let the jam cool completely before putting it in the freezer because the temperature of the freezer may cause it to spoil.
Can I store jam in freezer?
Heterogeneous mixtures of ions and molecules of electrolytes and solutes (e.g., sugars) can be used for the preservation and storage of food stuffs, such as jams. Moreover, these substances can help maintain the pH balance of a product while reducing microbial spoilage.
Is it OK to freeze jam in glass jars?
The question may be asking if it is acceptable to freeze jam after it is put into glass jars. Frozen jams are tricky because they will not always remain stable. For example, the sugar in the jam could become scorched and create an unwanted flavor profile. Glass jars may be susceptible to cracking during freezing and thawing cycles, which will cause leaking or breakage.
People often ask if it is OK to freeze jam in glass jars, and the answer is yes. However, when you’re cooking with glass jars you need to take care when pouring hot liquids into the jars because they may shatter. You also should avoid extreme changes in temperature when storing them in the freezer or fridge. If you are planning on freezing your jam in glass jars, keep them in a freezer bag so they won’t move around so much while they are being transported.
How long does homemade jam last in the freezer?
The length of time homemade jam lasts in the freezer will depend on the type of packaging it is placed in. If it is placed in a freezer bag, the jam should last for up to six months. If it is placed in a canning jar, the jam should last for about nine months.
The life of homemade jam in the freezer is dependent on the type of fruit, amount of sugar added, and how it is packaged. Jams with less sugar will become watery when frozen. The freeze-thaw process can cause changes to the flavor and consistency. Freeze jams only in small batches or use wide-mouth containers so they are easy to scoop out.
How do you defrost frozen jam?
Jam is a fruit preserves that can be easily stored and preserved for months. It consists of sugar and the natural pectin in some fruits like apples, grapes and peaches. Jam can be frozen and then defrosted later to use when desired. When freezing jam, it is important to do so in small portions so the jam does not freeze too hard and become difficult to scoop out of the container.
In order to defrost frozen jam, fill a bowl with boiling water and submerge the jar for about 30 minutes. The jam will thaw while submerged in the hot water. Once it has completely melted, it can be removed from the bowl and stored in the fridge.
Can you freeze jam in plastic containers?
Can you freeze jam in plastic containers? Yes, but because of the high sugar content, plastic containers are not recommended for storing high-sugar products. Plastic containers are also not as durable as other materials for this use. However, the jarred jam may be preserved by placing it in a freezer bag and freezing it according to standard food safety storage guidelines.
You may store homemade preserves in the freezer by transferring them into tightly sealed plastic containers. The jars will need to be heated in order to maintain the seal. This is done by filling a pot with enough water to cover the jars with at least an inch of water and heating it until the jars are submerged. Leave the jars in hot water for at least 5 minutes before carefully removing them from the pot, keeping their lids on until they are cool enough to touch.
Why is my freezer jam separating?
I have a freezer jam that has separated. I believe that this is due to the heterogenous composition of the fruit. The natural pectins in the different types of fruit bind to each other and form a gel, which is what becomes jam. The more sugar in the mixture, the more viscous the gelatin becomes- however if there is too much sugar or if your mixture is not at room temperature from being in a hot climate for too long, then it may separate.
I think my freezer jam is separating because the sugar and water may be too cold (below 0 degrees Celsius). The freezing point of sugar is about -10 degrees Celsius, and I don’t know what the freezing point of water is. When I put it in the freezer, the jam was thick and stuck together well.
How long will jam Keep in refrigerator?
There are various factors that determine how long a jam will last in the fridge, such as the preservation method used and whether it was properly sealed. The USDA advises against storing jams in the fridge for any longer than 8 weeks.
A jar of jam sealed with a lid or cellophane can be stored in the refrigerator for several months, but it will eventually break down and spoil.
Expiration dates are arbitrary and do not signify when a food item will become unsafe to consume. For example, pickles may last for six months before the vinegar in the recipe ferments too much and destroys the cukes. However, if there is no vinegar in the recipe, then pickles will last indefinitely without going bad. Because of variances in methods of preparation, processing, storage time, etc.
Why is my freezer jam cloudy?
The freezer jam could be cloudy because it is not properly whipped. If the jam was not whipped, then it may have not been adequately shaken to thoroughly mix in all of the sugar. The cloudiness could also be caused by freezing the jam too quickly which could result in ice crystals forming in the mixture.
The freezer jam is cloudy because of the high sugar content in it. The sugar from the fruit reacts with ice crystals from the freezer and causes a cloudy appearance.
What containers can I use for freezer jam?
You can use jars or containers with air-tight seals such as freezer bags, for freezer jams. Doing so will ensure the jam stays fresh and flavorful for a longer period of time.
If you are looking for a freezer-friendly option for your homemade jam, then you may want to consider using either an ice cube tray or silicone muffin tins. However, if you are looking for something more substantial than condiments, then glass jars with metal lids are the way to go.
How long does homemade jam last in fridge?
The shelf life of homemade jams typically lasts about 10 days to two weeks in the refrigerator.
Jam has a shelf life of about six months when stored in the fridge. This is because microorganisms will grow in the sugar-based jam, and these organisms could spoil the jam and make it unsafe to eat. In order to avoid this from happening, it is important to follow proper guidelines for storage, such as storing it in glass containers with clean lids and ensuring that the jars are filled up and sealed properly to avoid any air from getting inside.
How do you store homemade jam?
Most homemade jam can be stored in the refrigerator for up to a month. The best way to avoid any spoilage is to find a container that can withstand a high degree of hot and cold, such as a glass jar with a lid. Always make sure that the jar you use is clean and sterilized before filling it with jam. If you have leftover jam from when you made it, place it in a bowl with plastic wrap on top, this will help preserve the flavor.
Jam is often made in large batches and then stored in glass jars or sealed containers. However, when making your own jam it is best not to use jars with metal lids as the lids may rust due to sugar in the jam. It is best to store homemade jam in the fridge; if the jam contains low-acid fruits, such as strawberries or raspberries, it should be placed in a container that is sealed and filled with boiling water.
Can you freeze jam without pectin?
Pectin is an important part of creating a set, or thickened, jam. Without the pectin you would have to cook the fruit until it was soft enough that it could be processed into a jam-like consistency. If you are using only pureed fruit then this may not be necessary for some types of berries. Process pureed fruit together with sugar and lemon juice in a food processor fitted with a metal blade.
Jam is a food that typically contains fruit, sugar, and pectin. The fruit provides the bulk of the flavor, while the pectin helps to thicken the jam without causing it to jell too quickly. Jam can be frozen in order to preserve it for an extended length of time.
How do you know if homemade jam is bad?
You can tell if homemade jam is bad by using a pH indicator. A low pH indicates that the jam is spoiled, whereas a high pH means it has not yet spoiled.
There are many signs of bad homemade jam, some of them more obvious than others. One can tell if the jam is bad by observing the texture. If the jam has separated and there are oily or greasy chunks, then it is most likely spoiled. Another way to spot spoiled fruit jams is by observing their color–if they are brownish or gray-green, then they are spoiled.
Do you need to sterilize jars for jam?
It is not necessary to sterilize jars for jam, but it would be beneficial for the long-term health of the jams. The reason that this is not necessary is because fruit typically contains very few microorganisms to begin with and the jars are not in contact with open air where they could become contaminated.
If the recipe states that the jars are to be sterilized, then this is not necessary. If they are to be filled with boiling water, it is best for them to have been thoroughly cleaned and dried before being placed in the pot.
Why is jam stored in glass jars?
Jam is stored in glass jars because the jar’s thickness prevents oxygen from reaching inside. This protects all of the ingredients that are mixed together to create the flavors, colors, and textures that are loved by the jam-eating community. The glass also has a slightly acidic quality which balances out any flavors that may come off as too sweet.
Jam is stored in glass jars because it is more likely to remain fresh when packaged in this way. Glass jars are also easier to clean than plastic containers which can retain flavors and odors that would contaminate the fruit jam. Fermenting fruit jams can also cause them to spoil faster, so glass jars are better able to contain any spillage.
Do you have to seal freezer jam?
You do not have to seal freezer jam because it will stay fresh as long as the lid is on.
Jam is a sweetened food product made by cooking fruit with sugar. Freezer jam contains the same proportions of fruit and sugar, but is processed without any water or air, which prevents it from spoiling. To make freezer jam, one must simply cook the fruit until it has turned into a mushy mixture.
Why is the fruit floating in my jam?
The fruit in your jam is floating because there was not enough sugar added to the mixture when combined with the pectin. There isn’t enough sugar to keep the water in syrup form, so instead it turns into a liquid. The fruit will continue to float until the mixture cools down and becomes more viscous.
Fruit floats in a container to the top of a thick liquid. This is called a fruit “jam” because it is thick and sticky, like the common food jam. After making a jam, one can see that the fruit does not sink below the surface to be consumed with the thick liquid. The question as to why this happens could be answered by using complex academic jargon.
Why did my strawberry jam turn brown?
The most common explanation for this is oxidation. The strawberries have enzymes that break down their own pectin, which is responsible for thickening the jam. The enzymes are broken down by reactive plant enzymes called polyphenol oxidases, when they come in contact with oxygen in the air. Darker berries, blackberries or raspberries are more likely to brown due to increased content of natural phenolic compounds in them.
The red pigment in strawberries, called lycopene, turns brown when heated. Heating sugars and acid together can also produce brown-colored products called melanoidins. Browning of jam is caused by the Maillard reaction.
How can I thicken jam without pectin?
To thicken jam without pectin, use a technique called “straining.” The first step is to cook the fruit and sugar mixture until it becomes a thick syrup. Care should be taken not to overcook the fruit as it will become mushy. Pour the mixture into a large bowl and allow it to cool for 10 minutes. Next, place several paper towels over a wire mesh strainer set over a medium bowl.
Pectin is a naturally occurring substance in fruits which is used to thicken jams. There are two ways in which pectin can be used to thicken jams without adding any additional ingredients. Firstly, the jam can be cooked at a slightly higher temperature for significantly longer, making it thicker. Secondly, the jam can be cooked for less time but then sieved to remove the fruit solids, leaving only the gel.
How do you preserve jam?
To preserve jam, you need to cut the fruit and add sugar, fill the jars up to the top, and then boil them in water. You can also add pectin or fresh lemon juice to help keep the fruits from spoiling.
To maintain a preserved product, such as jam, the pH level of the product must be lowered through the process of acidification. By using citric or ascorbic acid to lower the pH level, the sugar in the jam is prevented from reacting with oxygen and creating a brown colour on its surface.
Is runny jam safe to eat?
The answer to this question is a complicated one. However, in general, it can be concluded that runny jam is not safe for human consumption because the consistency of the jam has been altered from its original state. In order to determine if a food product is safe for humans to eat, it must be determined whether or not the product has been contaminated, poisoned, or if there are any chemical changes in the food.
Jam is a fruit preserve made from fruit sugar and pectin, but it can be made from other ingredients such as apples or mixed vegetables. The consistency of jam can vary depending on the fruit that is used, but the more watery the jam is, the more unsafe it becomes to eat. Jams with high pectin content and completely pureed fruits will not be runny and will have a higher level of acidity.
Can you eat jam straight away?
The answer to this question is largely contingent on the consistency of the jam. If a jam is a liquid, it can be eaten immediately after being made. The liquid may need to be cooled first in order to avoid burning oneself while eating it. Jams that have been cooked until they have become thick and have lost their liquid content can be stored in airtight containers for up to two years before being eaten.
Contrary to popular opinion, it is not possible to eat jam straight away. Ripe fruit contains an enzyme known as pectinase which accelerates the setting of jam. Once the jar is opened, however, this catalyst is removed and the jam will not set sufficiently for consumption within 24 hours.
Why is my freezer jam gritty?
In order to investigate the cause of a gritty freezer jam, one should look into the composition of the fruit that was used in the jelly. The texture will be gritty due to larger particles of sugar and pectin. If a person wants a better quality mixture, it is recommended to use a fruit press because this will eliminate large particles from any fruit.
In order to customize a flavor for one’s palate, manufacturers will use a variety of natural and artificial sweeteners. The most common natural sweetener is sugar because it can be fermented from various sources, such as sugarcane or beets. Manufacturers choose artificial sweeteners to avoid production costs and the risk of contamination if they were to use a plant-based sweetener.
How do you keep jam from crystallizing?
One should not believe the phrase “a little dab will do you” when it comes to crystallizing jams– for this leads to lessened quality of the product. One should not stir jam while its being preserved, but instead, one should mix it thoroughly before putting it in jars. If one desires lemon flavor in a jam that is already flavored with oranges or other citrus, one should add the juice of one lemon before sealing the jar so as to prevent crystals from forming.
A way to keep jam from crystallizing is by heating the sugar mixture before adding it. This can be done by smashing the sugar with a fork, then pouring the liquid into the sugar without stirring at all. It will take about 10 minutes. Then, if it is to be mixed with other ingredients, these should be added now. Sugar can also be cut in half and boiled for up to 40 minutes before adding any other ingredients to avoid crystallization.
Do you seal jam jars when hot?
Do you seal jam jars when hot?
It is recommended to wait for jars to cool before using them. And canning experts say that it’s best not to use them when the jam is still hot, as this may compromise the safety of the food inside. If you are in a situation where this is not possible, make sure to take care in how you store the jar in order to keep it safe from contamination.
This is a common misconception. It is widely believed that hot jelly jars cannot be sealed. As the molten jam cools, it contracts and creates a vacuum seal when the lid is put on. This is incorrect; in fact, when used incorrectly, it can lead to excessive buildup of pressure that may cause the jar to burst open when opened. Jam jars must be cooled completely before sealing in order to avoid this problem.
Can I put freezer jam in Tupperware?
It is important to note that freezer jam will generally be more stable than traditional jam, and is typically shelf-stable for up to one year. This means that it should not require refrigeration, and can be stored at room temperature or in a cool location such as a cellar. However, it is the opinion of the National Center for Home Food Preservation that freezer jams should only be stored in airtight containers made from materials that do not allow oxygen or moisture to reach the food.
No, a Tupperware container is made of a polymer that does not allow for the proper fusion of the food to occur. If you want to store your jam in Tupperware, there are other containers available such as glass jars.
Can I use freezer jam pectin for cooked jam?
The answer is no. When making jam, the fruit is mixed with sugar and cooked until soft to make it thicken. If you use freezer jam pectin for this purpose, the cooked fruit will not thicken properly.
Yes, it is possible to use pectin for freezer jam in a cooked jam. The type of pectin needed in a cooked jam would be a low-methoxyl pectin.
How do I know if my freezer jam is set?
The presence of a solidified, stiff texture in the freezer jam is one indication that it has been sufficiently “set.” In order for this to be achieved, the sugar content in the freezer jam needs to lower from its boiling point, which is approximately 220°F. The same thing holds true for jelly or preserves.
If your freezer jam has set properly, you will be able to tell by the way it sets. If the freezer jam doesn’t feel like it’s setting and is gooey, make sure to mix some cornstarch with water and add it into the mixture. Make sure that the mixture is heated up on a low heat before adding in the cornstarch and water. Mix them together very well before turning off the heat and continue stirring the mixture for about 10 minutes.
Can I make jam and can it later?
When making jam, it is best to have a canner. A canner is a large pot that is designed for the purpose of sterilizing jars and allowing them to be boiled in order to seal them and process the food inside. Due to the high heat and pressure involved, it is not possible to make jams and store them later with standard methods.
The answer to this question is a resounding yes! Making homemade jam is not only rewarding, but also a great way to control the ingredients and prepare for a variety of diets. You can even make a few batches at once, so you always have some on hand.
One of the most important things to consider when making jam is the sugar content. For example, strawberry jam will require more sugar than grapefruit or cranberry.
Will jam go bad if not refrigerated?
The answer to the question is that jam will not go bad if it is not refrigerated. Jelly is made of fruit, sugar, pectin and water. Pectin will cause the jelly to thicken and bind together. This means that it will not need to be refrigerated.
Jam will not go bad if not refrigerated. Jam is made by cooking sugar with fruit. The process of making the jam kills the bacteria that would cause it to spoil. So jam does not need to be refrigerated and can be stored without refrigeration in a dark area such as a pantry or cabinet.
Do you have to can homemade jam?
No, homemade jam does not require canning. Depending on the acidity of the fruit, it may be possible for it to be preserved in the refrigerator. The flavor will not last as long but there is no risk of botulism, which can grow in canned jams.
The answer to this question is no. You do not have to can homemade jam. Making and storing the jam in jars with lids is much more economical than purchasing it because you can use your own ingredients and tailor them to your dietary needs.
Why do you add lemon juice to jam?
In the process of making jam, sugar is combined with fruit and boiled to a temperature that will form a type of sugar-syrup mixture. In order to achieve the desired consistency, it is important to ensure that all ingredients are evenly distributed, as well as heated at an appropriate temperature, if it is too low the fruit will not break down and if it is too high it can burn.
The addition of lemon juice in jam is done to inhibit the formation of oxalic acid and other organic acids, which lead to a sour taste in the product.
-Oxalic acid is formed by the oxidation of ascorbic acid with the help of oxygen, which is why making sure everything is clean and free from oxygen before boiling will help prevent this.
Can you use jam without a canner?
Canning jam requires a canner, which is a pot that is big enough for the hot water to cover the jars and comes with the necessary seal-able lids. Without a canner, it is impossible to create a proper seal on the jars of preserves and store them in order to preserve their quality and flavor over time.
Jam is a fruit preserve and condiment made from the juice and sugar (usually in equal amounts) of fruit boiled until thick and set with pectin. Jam can be stored at room temperature for up to 3 months or refrigerated for up to 10 months. However, you cannot store jam without proper preservation techniques such as canning it.
Does homemade jam have to be refrigerated?
According to the USDA, home-canned or homemade jams do not have to be refrigerated if they are processed in a boiling water bath for a specified period of time. This process inactivates any spoilage microorganisms in the food and prevents any spoilage from developing in the future.
No, homemade jam does not need to be refrigerated. Refrigeration is a process in which food is preserved by temporarily suspending the growth of bacteria in it. Home canned preserves, such as jams and jellies, can be stored on the shelf at room temperature for an indefinite period without spoiling. A canned product’s shelf life can be from weeks to years when stored at room temperature.
Why is pectin bad for you?
Pectin is an indigestible, soluble fiber and a form of polysaccharide. It can be found in fruits and vegetables. Pectin is bad because it binds with calcium and negatively affects the body’s ability to absorb calcium, which can lead to chronic health conditions such as osteoporosis.
Pectin is a carbohydrate found in many fruits. It is also used as an ingredient in jams, jellies, and preserves. Pectin may be good for you because it is high in fiber-like substances that are said to be beneficial to the digestive system. However, pectin is bad for you because it can cause excessive gas and therefore irritate your stomach.
Why is pectin used in jam?
Pectin is a natural polysaccharide found in high quantities in many fruits. In fruit jams, pectin affects the viscosity, thickeness and gel strength of the product. Pectin is popular in jams because it creates a more solid consistency, which makes the jam last longer.
A gelatinous substance called pectin is used in jam to thicken the mixture. Pectin is a soluble fiber which binds sugars in water, making them more viscous and reducing the overall rate at which sugar molecules are able to crystallize. This helps prevent jam from becoming too stiff or solidified if left in the jar for too long.
Do you wash fruit before making jam?
The answer to this question is a complete question. There are a lot of steps involved in the process of making jam, each of which could potentially result in contamination or spoilage. As such, it is important to take precautions at every step. For instance, you should wash fruit before juicing it, as the skin can harbor bacteria and other harmful invaders that can make their way into the juice later on and contaminate your finished product.
The following question: “Do you wash fruit before making jam?” is a metaphysical inquiry as to the need for thoroughly washing fruit before it is turned into jam; common sense dictates that this is not necessary.
Can botulism grow in homemade jam?
Botulism is an odorless, colorless, and tasteless type of bacteria that grows best in low oxygen, wet environments. Botulism is most commonly found in soil, dust, and seafood. It does not grow in most foods with the exception of homemade jams since it thrives in sugars and is most prevalent when food has been poorly canned or stored for a long time.
Botulism is a deadly bacteria that will not grow in high acid foods, which is why homemade jams typically are made with vinegar to balance out the natural sweetness of the fruit.
How long does homemade jam last without pectin?
Without the aid of commercial pectin, homemade jam will have a shorter shelf life. Pectin is a naturally occurring plant product that is extracted from the seed cases of most fruits – apple, raspberry, strawberry, etc., which can then be used to help preserve jams and jellies that lack sufficient acidity. It acts as a stabilizing agent in the absence of sufficient acidity levels in fruit jams.
When homemade jam is made without pectin, it will spoil after just a few days. The acidity in the fruit causes it to break down quickly when not held together by the extra sugar and commercial pectin found in store-bought jams.
A pectin is a natural food additive used to thicken or stabilize liquid foods such as jams and jellies.
Is mold on jam harmful?
The mold on the jam is not harmful. Simply cut off the mold using a knife and try to salvage as much of the remainder as you can. However, if it is already eaten, discard immediately.
Mold on jam is often harmless, but some people are allergic to the mold proteins. The most severe reactions can require hospitalization and ventilator support.
Mold on jam is often harmless, but some people are allergic to the mold proteins. The most severe reactions can require hospitalization and ventilator support. Molds are fungi that produce microscopic yeasts, which grow by feeding on organic matter such as fruits or grain.
Do you let jam cool before putting lids on?
The answer to this question is that it depends on the type of jam and personal preference. For example, strawberry jam should be allowed to cool for at least 15 minutes before being put into a container and then placed in the refrigerator because otherwise it can spoil. In contrast, raspberry jam may be placed in a container immediately after cooking because it is not as likely to spoil as quickly as strawberry jam.
Jam may be allowed to cool before placing the lid on to preserve their flavor. However, when one is in a hurry, they can place the lid on while it is still hot and it will form a vacuum seal.
What happens if you don’t sterilize canning jars?
The sealant may not form properly, which may cause the food to spoil during storage.
The many bacteria sitting on the jar’s inner surfaces will grow and thrive, ruining your food. It is also possible for harmful bacteria to fall into the jar and ruin the food even if you accidentally drop it or it falls off a counter. This can cause severe illness or death in some cases.
Can you use Milton to Sterilise jam jars?
A person can use Milton to sterilize jam jars. This is because Milton contains formaldehyde, the same chemical that is used in most household cleaning products to kill of bacteria which could spoil food. However, it should be noted that this will make the jar’s contents taste like formaldehyde which might not be for everyone.
It is not possible to use Milton to sterilize jam jars. The two substances would react and create poisonous gas, which could pose a health risk to anyone in the vicinity.