After palladium and rhodium electroplating on 925, the coating has good oxidation resistance and is not easy to yellow. Yellowing of silver ornaments will also be related to the wearer's physique.
Method for clean silver ornament with extended data
1. Soak in Coca-Cola 12 hours.
2. Apply lipstick on the cloth, then wipe the silver ornaments, and finally rinse them with water.
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.
Chemical properties of silver
Silver is dissolved in nitric acid to produce silver nitrate.
Ag+2HNO3 (concentrated) = AgNO3+H2O+NO2 =
3Ag+4HNO3 (dilution) = 3agno3+2h2o+no =
Silver is not easy to react with sulfuric acid, so sulfuric acid can be used to clean the copper oxide fire marks left by silver welding annealing in jewelry manufacturing. Silver easily reacts with sulfur and hydrogen sulfide to form black silver sulfide, which is often found on tarnished silver coins or other articles. Silver can react with oxygen at high temperature to produce brown-black silver oxide (it can also react at room temperature, but the speed is very slow).
In the presence of potassium bromide (KBr), metallic silver will be eroded by strong oxidants such as potassium permanganate or potassium dichromate. These compounds are used in photography to bleach visible images and convert them into silver halide, which can be removed by sodium thiosulfate and re-developed to enhance the original images.