Red iron oxide is pure and extracted from nature. It may be used in soap and cosmetics as colorant, experiment first with a small amount until you obtain a shade you like. If used properly in soap, it will produce a beautiful shade of red. Mesh - 325 (100% finer than 400 mesh). Use approximately 1/4 to 1/2 teaspoon per pound of cold process soap. Gloves are recommended to prevent skin staining, protect work areas. INCI - Iron Oxide. Shelf life: Indefinite.