适用于所有类型的奶粉。其原理是通过向奶粉的试验部分加水来制备复原乳。以酚酞为指示剂，硫酸钴（II）为参比色溶液，用氢氧化钠溶液滴定复原乳。滴定中使用的毫升数乘以系数2，以获得中和相当于10 g非脂肪固体的牛奶所需的毫升数。

Applies to all types of dried milk. The principle is based on the preparation of reconstituted milk by addition of water to a test portion of dried milk. The reconstituted milk is titrated with sodium hydroxide solution using phenolphthalein as indicator and cobalt(II) sulphate as reference colour solution. The number of millilitres used in the titration is multiplied by the factor 2 in order to obtain the number of millilitres required to neutralize a quantity of milk corresponding to 10 g of solids-not-fat.