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Rust is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.Several forms of rust are distinguishable both visually and by spectroscopy, and form under different circumstances.ther forms of rust exist, like the result of reactions between iron and chloride in an environment deprived of oxygen â rebar used in underwater concrete pillars is an example â which generates green rust.
Q: What causes rusty water, and is it safe to drink? A: Rust is oxidized iron. It can originate anywhere from a water main to your own plumbing. Tap water can turn reddish brown due to iron particles that break free from sediment inside corroded iron or steel pipes. Corroded pipes are common in North American cities, where some water systems are more than 100 years old.