Why does the stainless steel kitchen sink cup leave a black mark after putting the hot pot on it?

Kitchen sinks are divided into cast iron enamel, ceramics, stainless steel, artificial stone, steel plate enamel, acrylic, crystallized stone sinks, etc. according to materials

As you said, it should not be pure stainless steel, it should be Caused by high temperature oxidation.

Proper maintenance of the sink

1. Clean it immediately after use, dry it and store it. Try not to let water droplets stay on the surface of the sink, because water with high iron content will cause floating rust, Water with high mineral content will produce white film.

2. If mineral precipitation appears at the bottom of the sink, remove it with diluted vinegar and rinse with water.

3. Do not keep hard or rusty objects in contact with the sink for a long time.

4. Do not leave rubber pan mats, wet sponges or cleaning tablets in the sink all night.

5. Be aware that fluoride-containing household products, bleach, food, silver-containing cleaning products and cleaning products containing sulfur and hydrochloric acid are potentially harmful to the sink.

6. Be aware that the gases released by bleach or chemical cleaners placed in the kitchen cabinets will corrode the bottom of the sink.

7. If the chemical components of photography or soldering iron flux come into contact with the sink, the sink must be flushed immediately.

8. Do not leave pickles, mayonnaise, mustard and salty foods in the sink for a long time.

9. Do not use iron rings or rough cleaning materials to clean the sink.

10. Any incorrect use or incorrect cleaning method will cause damage to the sink.