H silica-coated middle chrome yellow is prepared by the precipiation of chromate salt with lead nitrate solutions with special surface treatment of silica, aluminum and other additives.

• 中铬黄是由铬酸盐和硝酸铅相互沉淀，再经过硅、铝等助剂特殊处理所得的耐热性特佳的中黄色粉末。