There is rust present.
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Rust-colored water in the radiator typically indicates the presence of rust or corrosion within the cooling system. This can be caused by old coolant, lack of maintenance, or the presence of air or contaminants in the system. It is important to flush the system and potentially replace the coolant to prevent damage to the engine.
The gas that forms rust with water and iron is oxygen. Rust is formed when iron reacts with oxygen and water in a process called oxidation.
rust oxidizes when exposed to water
Rust is not toxic but it is disagreeable.
The cause of iron rust is oxygen and water.
Rust forms anywhere iron and oxygen meet with the presence of water