CLEANLINESS
The following is a somewhat elaborate form of the test for specks which indicates the total amount of foreign particles in a sample. Five millilitres of distilled water are added to I g of dried starch. The mixture is stirred, and then 5 ml of 0.7 N sodium hydroxide solution are added and the uniform gelatinized mixture is examined for impurities. The degree of whiteness and clearness depends on the quantity of pigment, dirt and protein present in the starch.