The hemoglobin colorant was prepared from fresh pig blood, through separating blood serum, acting with antiseptic agents, color producing reagents and antioxidants, without any nitric or nitrous matters.

• 以新鲜猪血为原料，分离血清，依次进行防腐、发色和抗氧化处理，制成浆状的无硝血红蛋白着色剂。