MILK AND ITS PRODUCTS 



207 



After dilution, the acid must be cooled to 60 F. before being 

 used in the test. 



The details of the test are as follows: Mix thoroughly 

 the sample of milk, which should be at a temperature of 

 about 60 F. Quickly fill the pipette to the mark with milk, 



FIG. 70. Appearance of completed test. 



and run the milk into the test bottle. Fill the acid measure 

 to the mark with the sulphuric acid and pour the acid cau- 

 tiously into the test bottle. Mix the milk and acid 

 thoroughly by giving the test bottle a rotary motion. Let 

 the bottle and contents stand from two to five minutes and 

 then mix again. 



