Why does silverware turn black? What happened with the air?
Many people don't think about it and tell me that it is oxygen! wrong! It is actually sulfur in the air. Silver and oxygen do not react at room temperature, even if the silver oxide formed by the reaction is white, the blackening of the silver is obviously not silver oxide; silver at room temperature and sulfur can directly reflect that the formed silver sulfide is black.
This is the principle that ancient emperors used silver needles to test poison before eating. The ancient poison was mainly arsenic. The main component of arsenic was arsenic sulfide; this is also the reason why sterling silver jewelry should not touch perfume, sulfur soap, etc.! It is also recommended that friends who are engaged in chemical work must choose to wear silverware to absorb sulfides for your skin!
Silverware can be divided into different according to the production process:
1. Traditional silver
There is no sterling silver jewellery with artificial plating purity in line with national regulations. The purity includes S990 and S999. The main categories are adult bracelets, most baby bracelets, and most baby silver locks.
2, craft silver
There are artificial silver plating in accordance with the national regulations of pure silver jewelry, the coating is palladium alloy or platinum, the purity is S925, the main categories are rings, necklaces, bracelets, some precision bracelets, lock bags.
Silverware maintenance
1, wipe with toothpaste
Advantages: Let the silver ornaments quickly return to light; Disadvantages: lighten the silver decorative pattern.
Although the toothpaste is a paste, it is actually composed of fine particles. Wiping with toothpaste is equivalent to polishing the jewelry. Therefore, the process silver must not be cleaned with toothpaste, because the plating will be thrown away, so that the silver decoration will oxidize faster!
2, white vinegar, alcohol wipe
The black silver sulfide is dissolved in the ester acid, and the silver jewelry is once again shiny with cotton vinegar and alcohol.
3, overnight tea soak
Soak the oxidized silverware with the tea after a night of immersion. Soak for about 12 hours. Remove the water and rinse it to remove the silver oxide, so that the jewelry will be bright again.
4, cola soak
This is the way to witness the miracle: soak the oxidized silverware with a small amount of cola (small half bottle, local tyrants can choose to buy a new bottle), soak for about 12 hours, remove the water and rinse, you can make the silver decoration look like new! This method is most suitable for craft silver, especially necklaces, bracelets, or hollow jewelry, which has a miraculous effect on the dirt in the gap!
5, wipe the silver cloth
It removes silver oxide from the surface of the jewelry, just like toothpaste! Do not clean the silver cloth because there is polishing powder on the surface of the silver cloth.
6, wash the silver water
You can buy it or go to the jewelry store to clean the jewelry with silver-washed water. The effect is very obvious, but because it does not have much benefit to the silverware and the body, it is not recommended.
7, the focus is coming! It’s the egg tart!
(1) First, buy an egg tart, don't misunderstand you, don't make a joke, buy an egg tart, eat it first, and leave the tin foil wrapped in egg tarts to clean.
(2), open the fire and put the pot into the water, did not make fun of you, really is not cooking is surgery!
(3) Wrap the yellow or black unstained silverware with tin foil, then put some salt and cook in a boiling pot for 5 minutes.
(4), remove the silverware and rinse it with water.
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