The method of producing coke pool color by nitrogen method;

Pulverize extremely dry (sliced sweet potato or selenium-containing carrot), weigh 200 Jin of this material, add appropriate amount of T water and mix well to loosen it, steam it in a cage and move it into a cylinder. According to 1509/kg, add amylase (product of Wuxi Enzyme Preparation Factory, Jiangsu Province), mix well, the temperature in the cylinder is S0, about 60℃, get drunk for 8 hours, and it is better to inject it.