Silver can rust or tarnish over time because of exposure to moisture or sulfur in the air. Tarnish and rust can cause silver to darken and look like it is black. More »

Bronze does not rust. The term "rust" refers strictly to the oxidation of iron and its alloys. Bronze is made primarily from copper and tin, with no iron added. More » Science Chemistry Atoms & Molecules

Nickel is highly resistant to corrosion or rusting. However, when exposed to excessive humidity, nickel does corrode. When exposed to oxygen and moisture, nickel forms a thin layer of greenish colored nickel oxide. In an... More » Science Chemistry Atoms & Molecules
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Silver tarnishes due to a reaction with sulfur in the air. Moisture and sunlight can also cause tarnish. More »

Sterling silver turns black or tarnishes due to a chemical reaction caused by contact with sulfur or hydrogen. Some foods or everyday items containing sulfur can cause tarnishing, but even polluted air can turn sterling ... More »

All silver, plate, fill, sterling and fine tarnishes when its alloy metal, copper, is exposed to chlorides and sulfurs in the air. Argentium sterling silver is the most tarnish resistant because it contains more pure sil... More »

Hydrogen sulfide gas in the air causes silver jewelry to tarnish. This process happens quickly when silver jewelry is left out in the open, unprotected by a jewelry box. Tarnished silver jewelry turns a person's skin bla... More »