How do I have black stuff on the threads of the lid of my stainless steel thermos cup

Preliminary conclusion that your thermos cup is not pure stainless steel! Those black things are metal powder formed by the friction between the mouth and lid of the cup, and the metal mud formed by mixing with water! If you use this cup to make tea, it will produce substances that are harmful to health!

Just find a magnet and see if it can suck on the cup to tell if your cup is stainless steel! If the magnet can't be absorbed, it is stainless steel, and if it can be absorbed, it is stainless iron.

The magnet is best the one built into the Walkman.

There are several reasons why there is always something black on the thread of the stainless steel thermos cup lid:

1.It may be that the lid is twisted with too much force, causing wear.

2.If the quality of the material is not up to par, it may be that the material quality of the cup lid is not up to par.

3.316 stainless steel can reach the medical grade, and has high stability in corrosion resistance and high temperature resistance, and most of the 316 or 316L are used in medical treatment. So pay attention to whether the seller's statement is true or not.

You can check these possible causes, and if you still can't solve the problem, it is recommended to consult a professional.

If you can tell me what you often hold in your thermos cup, it will be more valuable for reference.

If you just fill water (just water, nothing added!) Something like limescale is more likely.

If you are filled with tea, milk and the like, the problem is easy, tea stains, milk stains and the like, just wipe it often, don't worry.

The thread should always be tightened after you use it (I guess), then there will be some accumulation of liquid in the cup, so in summary, it should be the traces of the liquid in the cup.

1. Normal phenomenon.

It is normal for general stainless steel products to have a certain amount of oil stain on the wall of the cup due to grinding, rust prevention and other reasons, so it should be cleaned and soaked before use.

2. Ferric oxide.

There is also a situation where ferric oxide is present, and it does not matter if it enters the body, there is no need to worry.

3. Unqualified stainless steel products are used.

There is also a situation where unqualified stainless steel products are used, and after high temperature, stainless steel will have dissolved metal ions absorbed into the blood, such as chromium, nickel and other substances, which is not good for the human body. Do not use substandard stainless steel products.

If there are black spots in the thermos cup, it is estimated that it is a scratch if it can't be washed off, which is just a flaw. Stainless steel scratches, and in the frosted walls, the scratches will be smoother than the surrounding ones, and there will be a mirror effect, as if you look at the smooth stainless steel sideways is black.

This is the quality of the thermos cup, you can contact the seller to ask for a return, if the seller does not return, you can complain to the Industrial and Commercial Bureau, if it is a metal liner thermos cup, the small black spot may be the appearance of rust spots, this situation is not recommended to continue to use, so as not to cause heavy metals in the water to exceed the standard.

Precautions for the use of thermos cups.

Before use, you can open the package, then blanch it several times with boiling water or detergent, sterilize it at high temperature, and do not hold carbonated drinks such as milk, dairy products and juices for a long time.

When washing, it can be cleaned with a soft cloth and detergent diluted with warm water, and alkaline bleach cannot be used.

In addition, in order to prevent odors or stains, please wash and dry them fully after use, these are common ways to use thermos cups, and you should pay more attention to do better.

1. It may be that the quality of the mechanical oil used in the production process is poor, and the general washing cannot be removed, so the hand will be black and greasy after holding it by hand. Method: Add a little more detergent to the water, boil for 5 minutes, and then rinse.

2. It is possible that there will be a layer of polished metal particles on the surface of stainless steel products. You can wash it with dish soap or detergent before use, and then use it so that your hands will not turn black.

3 may be wax, stainless steel by waxing and polishing to increase its brightness, it is recommended to wipe it with a cotton cloth, and it is no problem to brush it with hot water.

Wash the newly bought stainless steel basin rubbed a hand black, the quality of this stainless steel is not inconsistent.

It is not a problem of stainless steel quality, the stainless steel basin needs to be polished by manual mechanical grinding from a flat plate to stretching and forming.

This is a lubricant for stamping and drawing stainless steel, including some emulsifiers, water, and some abrasives and metal particles. It's definitely not safe to eat in your stomach, but it's good to scrub it a few more times.

Although there is a residue that indicates that this manufacturer is indeed a little irresponsible, but the lubricant will not react with the stainless steel, and there will be no residue in the inner tank after scrubbing, so the landlord can use it with confidence.

Stainless steel cups Why is there black when rubbed with paper? I just bought a stainless steel cup, and I wiped it hard with paper, and there will be black on the paper, does it contain lead, and I can't use such a cup, right?

Me too, just bought a stainless steel pot, washed with soap several times, wiped a layer of black with a napkin, a check to know that it is a chemical polishing material, called green wax, is a wax product, toxic, long-term ingestion may cause cell abnormalities, malaise, memory loss, etc., serious hit will also cause cancer. Thankfully, this will fade away with constant use, and a small amount in the short term is out of the way. To wipe clean, washing is not washed off, must be wiped hard, now that science is developed, people are becoming more and more "smart", used in negative science is becoming more and more common, nothing is safe, they only consider the appearance of a good look, can sell better, ** higher, but regardless of the health of others.

Why is there something black when I rub a newly bought stainless steel cup? That's because there is grinding in the production process, so this should be a powder of stainless steel.

When it comes to the most fireworks in the home, it is undoubtedly the kitchen. The food we need every day is produced from the kitchen, which inevitably becomes the place where the oil smoke is the heaviest.

These grease stains are even more difficult to clean up after a long time! But besides, the grease stains in the kitchen are the most difficult to clean, and the bottom of the pot is definitely one. The pot we use for stir-frying and cooking every day, because the bottom is in contact with natural gas, and the top is in contact with oil smoke, and over time, a layer of hard and thick black dirt will form at the bottom of the pot, and it takes a lot of effort to remove it.

But today I will teach you a few tricks, and it will be convenient and clean to clean the grease at the bottom of the pot in the future!

1. How to clean the dirt at the bottom of the pot of different materials?

1. Remove the dirt from the bottom of the stainless steel pot

Add about half a pot of cold water to a larger pot, add some pineapple skin, and then put the small stainless steel pots into them one by one, heat and boil them directly for a while, and then take them out after cooling, and you will find that these stainless steel pots become shiny as new. However, there is one thing worth noting, if it is stainless steel tableware with a wooden handle or a plastic handle, it should not be steamed or scalded in boiling water, so as not to damage the wooden handle or plastic handle due to heat expansion.

Summary. Generally, the small package in the stainless steel thermos cup is desiccant. The ingredients are calcium chloride and silica gel, which is afraid of being drunk by mistake, and the desiccant is non-toxic, tasteless, non-contact corrosive, and environmentally pollution-free.

Its main function is to reduce the humidity in the food bag, prevent food from spoiling, and quicklime desiccant will have the highest risk, there is a food containing quicklime desiccant at home, must be properly disposed of.

Generally, the stainless steel thermos cup is a desiccant in a small package that is trapped and resistant to rot. The ingredients are calcium chloride and silica gel, which are afraid of being drunk by mistake, and the desiccant is non-toxic, tasteless, non-contact corrosive, and environmentally pollution-free. Its main function is to reduce the humidity in the food bag, prevent food from deterioration and corruption, and quicklime desiccant will have the highest risk.

When you say black, it should be activated charcoal deodorant.

The main raw materials are coconut shell charcoal, bamboo charcoal, etc., and the principle is to use the principle of carbon to absorb odors and remove the plastic and metal odors in the thermos cup.

Is it toxic. This desiccant is non-toxic and environmentally friendly, so there is no need to worry about it after ingestion, and it will not be harmful to the human body.