A silver article generally turns black kept in open few days . The article when rubbed with toothpaste again starts shining
Answers
Answered by
3
Answer:
because toothpaste has a shining chemical covers the silver article
Answered by
5
Explanation:
Toothpaste is abrasive. It typically contains 50% of one or more of these - checking a few packages here - calcium hydrogen phosphate, “microbeads” of unspecified nature (probably silica), calcium carbonate, hydroxyapatite, aluminum hydroxide, hydrated silica. It’s like brushing your teeth with extremely fine sandpaper. Naturally it works just as well on metals, to remove a surface oxide film.
Similar questions