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A Color Test and Other Methods for Quality of Milk¹

Research Laboratory, Blue Valley Creamery Company, Chicago, Illinois

ABSTRACT

For the rapid testing of milk for cheese making or other special purposes where unsuitable milk may be received, three rapid methods are at hand:

1. Determination of the refractive index of the calcium chloride serum of the milk.
   
2. Determination of the amount of catalase.
   
3. Alcoholic-alizarin test. The latter gives the most useful information.
   

Ackerman's calcium chloride serum method is best known. This is briefly as follows: 30 cc. of milk are introduced into a cylinder 230 mm. long by 20 mm. diameter, 0.25 cc. CaCl₂ solution is added and the whole shaken vigorously. Then place a refrigerant tube 260 mm. long by 10 mm. wide in the cylinder. A holder containing 12 to 24 such cylinders is placed in a bath of rapidly boiling water, for fifteen minutes; the water condensation collects on the refrigerant tube and is returned into serum. The refractive index is then made of the serum at 17.5°C.

¹ The Rapid Analysis of Abnormal Milk by the Use of the Refractometer, by the Measurement of Catalase and by the Alcoholic-Alizarin Test. By Valencien and Panchaud. Le Lait, iii, 529 (1923).