What is the reason why wearing silver jewelry turns black?

The blackening of silver ornaments is a normal natural phenomenon. Because sulfur and oxides in natural media such as air have a certain corrosive effect on silver, after wearing for a period of time, some tiny spots (silver sulfide film) will appear, which will spread into pieces or even turn black for a long time. Therefore, at present, silver jewelry has some discoloration due to oxidation.

I. Introduction

Silver is a transition metal. Chemical symbol Ag. Silver is one of the metals known and used in ancient times, and it is an important precious metal. Silver exists in the form of simple substance in nature, but most of it exists in silver mines in the form of bound state. Silver has relatively stable physical and chemical properties, good thermal and electrical conductivity, soft texture and rich ductility. Its reflectivity is extremely high, reaching over 99%. It has many important uses.

Second, maintenance

① Don't wear other precious metal jewelry when wearing silver jewelry to avoid collision, deformation or wear.

(2) Avoid contact with water vapor and chemicals, and avoid swimming in clothes, especially in the sea.

③ Wipe it with cotton cloth after wearing it every day, and put it in a jewelry box or bag for sealed preservation.

(4) It has been oxidized to black, which can be scrubbed with a soft brush dipped in toothpaste or cleaned with hand sanitizer or detergent. If it is really impossible to clean, brush it with silver washing water and dry it with cotton cloth after washing.

Third, the cleaning method

1. Soak in Coca-Cola 12 hours.

2. Apply lipstick on the cloth, then wipe the silver ornaments, and finally rinse them with water.

This method is absolutely effective.

3. Scrub with acetic acid.

4. make tea for one night.

5. Wipe with a silver cloth.

6. Soak in silver washing water for one to two minutes.

7. Apply the correction fluid to the silver jewelry, and wipe the silver jewelry with a cloth before the correction fluid dries.

8. Brush with toothpaste and toothbrush.

9. Burn black silver ornaments with lighter (Note: This method is limited to pure silver (gold-plated and inlaid silver ornaments cannot be used. The temperature should not be too high, so it is forbidden to use matches, because matches contain sulfur, which will turn silver ornaments into silver sulfide, and then polish them with a silver rubbing cloth. This method makes plain silver ornaments particularly bright.

10, Yin Su's silver jewelry is often blackened, although it can be cleaned frequently, but it is also very troublesome.