CHAPTER VII 



CHANGES IN THE CREAM LINE DUE TO THE 

 PASTEURIZATION OF MILK 



Dealers who have had experience in the pas- 

 teurization of milk know that from time to time 

 they have trouble with what is known in the trade 

 as the "cream line" upon bottled milk. This may 

 mean that the line of demarcation between the 

 cream in the bottle and the skim milk just below it 

 is indistinct and faint, or it may mean that no 

 cream at all is visible and the contents of the bot- 

 tle has the same color all the way through. Again, 

 it may mean that the apparent amount of cream 

 upon the milk is lessened. Either one of these 

 conditions is a reason for complaint on the part of 

 the customers. Dealers are therefore anxious to 

 obtain as great a volume of cream as possible upon 

 the milk sold by them, and are also anxious to get 

 the line of division as distinct as possible. Deal- 

 ers are sometimes at a loss to know why milk will 

 at one time show a good cream line, and at another 

 time, when the conditions are apparently the same, 

 the cream will be disturbed. 

 208 



