Formula: Sodium alumino sulfosilicateEdit
Description: Ultramarine is a blue pigment consisting primarily of a double silicate of aluminium and sodium with some sulfides or sulfates, and occurring in nature as a proximate component of lapis lazuli. It was traditionally used for cave drawings and eventually pigments in art and other areas. In pyrotechnics, it is used as a fuel that burns bright yellow in color, but is rarely used anymore thanks to the development of such materials as sodium oxalate and cryolite . These newer materials are cheaper and easier to obtain, and therefore are more frequently used.
Hazards: Slight irritant. Carcinogenicity unknown.
Sources: Sold as Blue Pigment 29, Ultramarine, and Sodium alumino sulfosilicate from chemical suppliers, crafting, and ceramic stores.
Hazard Symbols: Xi