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Why do black silver ornaments brighten when boiled in alum solution?
The silverware darkens because silver reacts with hydrogen sulfide in the air to generate black silver sulfide (Ag2S), which reacts with alum (potassium aluminum sulfate dodecahydrate) * * *. After removing the silver sulfide, it turns back to the original light color of silver and becomes brighter.

2KAl(SO4)2+Ag2S = 2Ag+Al2(SO4)3+k2so 4+S

Maintenance:

1, silver jewelry should be cleaned before it is put away, and it is best to pack it in a closed bag to prevent oxidation and blackening. If the wearer sweats a lot, he can wipe the surface with a soft cloth every day to keep the luster and remove dirt. It is best to use special silver rubbing cloth for silver ornaments plated with platinum. Silver rubbing cloth can be purchased in silver jewelry brand stores. Note: Silver cloth contains maintenance ingredients and cannot be washed.

2. Daily cleaning of silver ornaments without platinum plating can be done by yourself, such as squeezing some toothpaste, adding some water, wiping with a soft cloth, brushing gaps with a soft toothbrush, and then rinsing with clear water. Don't touch the water on the silver ornaments inlaid with precious stones, so as not to affect the firmness of the glue. It is best to be cleaned by professionals in the store. )

There are many kinds of silver ornaments and different maintenance methods, so we can't generalize them. Many online maintenance methods can only be used as reference. It is best to ask the professionals in the store to avoid improper operation and damage to the beloved silver jewelry.

4, including the exquisite three-dimensional carving of silver ornaments, to avoid deliberate polishing. If you find that the silver ornaments are yellow, you should first clean up the thin seams of the silver ornaments with a small jewelry brush, and then gently wipe the surface with a silver cloth to restore the original silvery white and brightness. I suggest that if the silver cloth can recover about 80% silver, there is no need to use silver lotion and silver washing water, because these products are corrosive to some extent, and silver ornaments are more likely to turn yellow after using these products. Silver wipes contain silver maintenance ingredients and cannot be washed.

5. If the silver ornaments are not treated and collected after wearing, it is very likely that the silver ornaments will turn black. At this time, you should use a small jewelry brush to clean the fine seams of jewelry, then drop a drop of silver emulsion on the paper towel to wipe off the black oxide on the surface of jewelry, and then use a silver cloth to restore the original brightness of jewelry. After that, you should remember to do the daily general maintenance to prevent the silver ornaments from turning black again. Silver ornaments are difficult to rub white after many blackening.