Rust prevention thus requires coatings that preclude rust formation. Manganese phosphating is used for rust and corrosion prevention on steel. The panels have a special coating to prevent rust or corrosion. However, it is not impervious to corrosion or rust. Vanadate can be used for protecting steel against rust and corrosion by conversion coating. Tetanus is often associated with rust, especially rusty nails. But only iron or alloys that contain iron can rust. Reinforced concrete is also vulnerable to rust damage. Two main diseases are rust and leaf spot. Black cats can also "rust" in sunlight, the coat turning a lighter brownish-red shade. Most species of Hypericum are prone to thrips, scale, anthracnose, rust, and leaf spots. The mane is typically brownish and tinged with yellow, rust and black hairs. Buried iron artifacts may completely rust away in less than 100 years. The oxygen molecules in the air react with iron, forming rust. Punches rust, and the copper of matrices is recyclable.