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The iron oxide particles remain suspended in the water, but when the water evaporates, the particles remain, forming a reddish coating on the surface of the iron. Without the presence of water, objects cannot rust. Other metals besides iron and steel can rust when exposed to moisture, but not all rust is ârust-colored.â For instance, when copper or bronze rusts, it turns green. The green crust is called a patina.
The most common cause of iron deficiency anemia is gradual, prolonged blood loss. For this reason, menstruating women are particularly prone to anemia. In men, the most common cause of iron deficiency is blood loss in the digestive tract, resulting from disorders such as peptic ulcer, inflammatory bowel disease, and stomach or colon cancer. Sometimes hemorrhoids bleed enough to result in anemia.