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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.
Iron deficiency - Causes. 1  chronic bleeding (hemoglobin contains iron) 2  inadequate intake (see below) 3  substances (in diet or drugs) interfering with iron absorption. 4  malabsorption syndromes.