46 DAIRY LABORATORY GUIDE 



The glassware used in testing readily accumulates a film 

 of butter-fat and has to be kept thoroughly cleaned so as not 

 to interfere with the test. The fat can be removed by wash- 

 ing in a solution of water to which a small amount of washing 

 powder has been added and well dissolved by boiling. A 

 small brush will aid materially in cleaning the glassware, after 

 which it will need to be rinsed in clean water and inverted in 

 a rack to drain and dry. 



