After a long time, some of the colors of the tin foil turned gray

1. Can food tin foil be discolored?

If the food tin foil is placed for a long time or is not stored properly, the phenomenon of discoloration will occur, some tin foil will turn gray, and some tin foil will become black, once it becomes black, it can not be used continuously, which is due to the oxidation of tin foil.

Most of the current tin foil is aluminum foil, aluminum foil reacts with oxygen in the air to produce alumina, which is the reason for the discoloration of food tin foil, alumina is not too harmful to the human body under normal circumstances, but it is still recommended to discard the discolored food tin foil directly, after all, tin foil is easy to buy, and it is not very expensive.

Second, is food tin foil safe?

The tin foil used for dish production is generally food-grade tin foil, which is essentially aluminum foil, which does not contain lead and tin, but is made of flat and thin metal pure aluminum, and the safety of food tin foil that has passed the quality review is still quite high, and it is healthier and safer to use aluminum foil to grill food than direct barbecue.

However, it should be noted that there are some unscrupulous traders on the market, producing tin foil with excessive lead content, which will release heavy metal elements after high temperature heating, which will cause damage to the brain and kidneys, so when purchasing food tin foil, we must pay attention to the selection of high-quality food produced by regular manufacturers.

3. Can tin foil be used after it expires?

Most of the current tin foil is aluminum foil, there is a certain shelf life, if the tin foil is expired, it will usually change color because of the oxidation of aluminum to produce alumina, expired tin foil is not recommended to use, although the harm of alumina is not great, but as a tool for wrapping food, it is still necessary to pay attention to safety, if the aluminum is precipitated during the baking process, it may cause harm to the human body, so it is recommended to discard the expired tin foil directly.

It's oxidized, just scrape it with sandpaper

It works. Tinfoil.

Also known as aluminum foil, the color darkening is oxidized by prolonged exposure to the air. The harm of alumina to the human body is minimal (unless it is consumed in excess), so it can continue to be used. <

Tin foil, also known as aluminum foil, is darkened in color because it is oxidized when it is exposed to the air for a long time. Alumina is very harmful to the human body (unless it is consumed in excess), so it can continue to be used.

We can see tin foil in many places, and its most common use in daily life is to wrap food, such as barbecue, baking and so on. Shen Chun Bu tin foil is relatively bright silver-white, if we use tin foil and find that it changes color, then it is best not to use it again. This is because the tin foil will turn gray or black after oxidation.

What's going on?

This can no longer be used, gray or black indicates that it has been oxidized, generally because the tin foil is not preserved, long-term exposure to the air caused, pants town at this time will be used again harmful substances on the food, eating is not good for the body. Most of the current tin foil is aluminum foil. Alumina is formed when the foil reacts with oxygen in the air, and the foil changes color.

Under normal circumstances, alumina is not too harmful to the human body, but it is recommended to throw away discolored food tin foil.

The discoloration of tin foil is due to the formation of alumina by oxidation, and under normal circumstances, unless excessive consumption of alumina, the harm to the human body is very small, so there is no need to worry too much. Tin foil is generally not expensive, and it is better to discard it if it is discolored. Tin foil used to process food is usually food-grade tin foil, which is actually lead- and tin-free aluminium foil, made from pure metal aluminium that has been flattened and thinned.

The safety of food tin foil that has passed the quality inspection is not bad, and grilling food with aluminum foil is healthier and safer than grilling it directly.

Can be steamed. The tin foil used today is actually aluminum foil, which is a thin sheet with a thickness of less than that processed by an aluminum foil rolling machine. Due to its high melting point, it begins to melt when heated above 660°C.

It can be used for regular barbecue food, baked goods, and even traditional chicken chicken wrapped in aluminum foil for baking, which is both clean and hygienic while maintaining the original flavor.

is due to tin foil.

Oxidation reaction occurs in contact with air for a long time, and it is best not to use oxidized tin foil, and it is recommended to buy new tin foil. Tin foil is mainly used in the kitchen for cooking, serving food, or to make materials that can be easily cleaned. Aluminum foil for food can be used to wrap food on both sides, usually on a glossy surface to improve heat conduction.

Effect. <

The discoloration of tin foil in the middle is due to the oxidation reaction of tin foil in contact with air for a long time, and it is best not to use oxidized tin foil, it is recommended to buy new tin foil. Tin foil is mainly used in the kitchen for cooking, serving food, or to make materials that can be easily cleaned. Aluminum foil for food can be used to wrap food on both sides, and is usually wrapped in a glossy surface to improve heat conduction.

Throw it away, don't use it anymore. Tinfoil.

The gray in the middle is due to the oxidation reaction of the tin foil in contact with air for a long time.

Continued use of local rents will cause toxins to get on food, which is not good for health. Tin foil is a film-like metallic paper coated or pasted with silver, mostly silvery-white, which is actually aluminum foil.

It is mainly used in the kitchen to cook, hold food, or make some materials that can be easily cleaned. <

How to dispose of the tin foil after it is grayed in the middle: throw it away and no longer use it. The gray in the middle of the tin foil is due to the oxidation reaction of the tin foil in contact with the air for a long time, and if it is used for a long time, it will get toxins on the food, which is not good for health.

Tin foil is a kind of film-like metallic paper coated or pasted with silver, mostly silvery-white, in fact, the cherry blossom is aluminum foil, which is mainly used in the kitchen to cook, hold food, or to make some materials that can be easily cleaned. Most of the foil is shiny on one side and matte on the other.

Aluminum foil for food can be used to wrap food on both sides, and it is usually recommended to wrap it on a shiny surface to enhance heat conduction. Effect.

Tin foil can not be used if it is discolored, it will oxidize after a long time, generate alumina, make the tin foil darker, and cause harm to the human body in the process of contact with food. The edge of the tin foil is sharp, so be careful not to be scratched when using, the tin foil has the effect of absorbing heat and moisture, and can store good food and make barbecue.

1. It cannot be used

Tin foil is discolored and can not be used, tin foil is made of aluminum, placed for too long, aluminum foil and oxygen react to produce alumina, so that tin foil becomes gray or black, tin foil is often used to package food, attention should be paid to safety, discolored expired tin foil should be discarded in time.

3. Precautions

The bright side of the tin foil and ruler color is the light-sensitive side, and the darker side is the matte side, so pay attention to distinguish it when using. The edges of the thin foil are very sharp, so be careful when using it to avoid scratching your hands. In addition, tin foil is a high genus of golden socks and cannot be put into the microwave oven to heat.

3. Daily use

Tin foil has a wide range of uses, has the effect of heat absorption, heat preservation, sealing, moisture-proof, can store food that is easily wet, and can also be used to make barbecue. When grilling, wrapping the food in tin foil can evenly distribute the heat on the surface of the food, making it easier to cook and avoid burning.