Ab. Corradi et al., PREPARATION AND PROPERTIES OF FAST-FIRED PORCELAIN TILES CONTAINING NATURAL CHROMITE, American Ceramic Society bulletin, 72(5), 1993, pp. 63-69
Natural magnesium iron chromite can be used as a pigment for coloring
high-sintered porcelain tiles. However, it is important to control the
amount, firing time and temperature, and size distribution of the chr
omite powders to produce different color shades of the fired tiles fro
m gray to black.