After scrubbing with toothpaste, be sure to rinse with clean 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 silverware. When silver chloride is decomposed by light, it will still lead to the surface blackening of silverware.
Extended data:
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 silverware. When silver chloride is decomposed by light, it will still lead to the surface blackening of silverware. Many people's silverware turns black soon after being scrubbed with toothpaste. The possible reason is to scrub with tap water rich in residual chlorine.
Understand the principle of removing black from toothpaste. If there is calcium carbonate micropowder, you can find a cloth, grab a handful of micropowder and rub it slightly, remove the black from silverware, and then find a clean dry cloth to wipe it without washing.
There are silver cloth and silver washing liquid on the market, which can quickly erase or wash away the black on the silver surface.
Baidu Encyclopedia-Gold (Precious Metals)
Reference source: Baidu Encyclopedia-Silver (precious metal)