Red iron oxide (Fe2O3) is the normal state of iron oxide. It is the most oxidized form, and when reduced, it is reduced to magnetite. This chemical is 81% Fe2 O3, which is bright red in its raw and powdered form. As a glass element, it can create various effects depending on the conditions. In general, the following happens with iron oxide: Oxidation burns produce red iron oxide Reducing burns produces black iron oxide The amount of iron oxide present in the glaze will affect the colors as well. Iron oxides can be used in liquid clays and washes and can also be applied directly to the surface of the clay body, a technique often used to create a textured look. Suggested concentrations of iron are as follows: 0.5-8% in slips up to 15% in glazes Since the concentration ranges are very wide, we recommend that you refer to one of the helpful glass recipe books available for reference. In powder form, red iron oxide can irritate the skin and irritate the eyes, and is very harmful if inhaled. Please use protective caps when handling this chemical.