The extraction solvent is made up by adding one-tenth gallon strong ammonia (28% NH3OH; 56% NHtOH) to nine-tenths gallon methanol. After mixing, this is added to nine gallons of chloroform to give 10 gallons of extraction solvent. The use of methanol is necessary because without it the ammonia does not mix into the chloroform. Instead, it would float on top of the chloroform giving an unhomogenous mixture.