1, toothpaste.

Toothpaste is a good helper for removing black from silver bracelets. Toothpaste is rich in fine calcium carbonate particles, and the friction of these particles can wipe off the silver oxide on the surface. Find a toothbrush, patiently wipe it with a little toothpaste for a while, and then wash it with clean water. It should be noted that after scrubbing with toothpaste, it must be washed with clear water, preferably pure water, not chlorinated tap water.

Tap water containing residual chlorine can easily lead to the formation of silver chloride on the surface of silver bracelet, and silver chloride will still cause the surface of silver bracelet to turn black when it is decomposed by light. Many people's silver bracelets turn black soon after being scrubbed with toothpaste. The possible reason is to scrub with tap water rich in residual chlorine.

2, tin foil with salt.

Prepare a small bowl, then cover the bottom of the bowl with a large piece of tin foil, with the bright side up, then put the silver ornaments that need to be cleaned in and pour in salt. Salt must cover the jewels. Pour boiling water, stir with chopsticks, wait a few minutes, and you will find that the phenomenon of silver jewelry blackening disappears.

The material of tin foil is aluminum, and aluminum and salt together provide the electrolyte environment mechanism. After heating with boiling water, a chemical reaction occurs, and silver sulfide is reduced to its original simple substance through the electrolyte environment. In this way, our ornaments will naturally become as bright as new. However, it should be noted that this method cannot be used to clean silver jewelry inlaid with alloy jewelry, otherwise it will easily damage the jewelry, and the loss will outweigh the gain.

3. Alcohol or ammonia.

A clean piece can be prepared, which is not scrubbed by alcohol or ammonia, and reacts with black oxide. This method is mild.

4. Coke.

Coke is rich in carbon dioxide. When silver sulfide on the surface of silver jewelry meets carbonic acid, precipitation and transformation reaction will occur. But it will not take effect immediately after wiping, and it needs to be soaked. How long it takes to soak depends on how serious the oxidation spots on the silver jewelry are. You can only observe while soaking.

This is more suitable for bracelets that are not easy to brush. There are many contours and so on. If you can't brush them, use this method.