24 



DAIRY LABORATORY GUIDE 



stirring as in the previous tests until a permanent 

 pink color remains in the milk. The number of c.c. 

 used divided by 10 indicates the per cent of acid in 



Fig. 22. — Apparatus for Marshall's 

 Acid Test 



the milk or cream being tested. Thus, if two (2) c.c. 

 of neutralizer has been used the milk contains .2 

 per cent of acid. 



EXERCISE VII 



Pasteurization 



Fill jacketed space of pasteurizer with water and 

 turn on steam until the desired temperature is 



