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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 »

To remove rust, apply a rust-removal solution to the affected area, and scrape the rust off with a putty knife. Rust removers are very acidic and give off harsh fumes, so be sure to use gloves, goggles and a mask. More »

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Rust is not toxic in small doses, but can be toxic if a large quantity is ingested or if it enters the body intravenously. Any doses greater than 100 to 200 milligrams per kilogram could be considered lethal. More »

www.reference.com Health Pain & Symptoms
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