Chrome Tin Pink Sphene, an inorganic pigment, is a reaction product of high temperature calcination in which Calcium (II) Oxide, Tin (IV) Oxide, Silicon (IV) Oxide, and Chromium (III) Oxide in varying amounts are homogeneously and ionically interdiffused to form a crystalline matrix of tin sphene. Its composition may include either or both of the modifiers B2O3 and PbO