The preparation of brow stains of following types was described: (1) ZnFeCrO 4; (2) partial ZnO of ZnFeCrO 4 replaced by FeO or FeO+NiO; (3) partial Fe 2O 3 or Fe 2O 3+Cr 2O 3 of ZnFeCrO 4replaced by Al 2O 3. The synthetic process and the cryst