TESTING FOR BUTTSRFAT 



625 



Purpose and Use of Glymol. Glymol is a high quality of 

 white mineral oil, similar to typewriter oil. It is slightly lighter 

 than butterfat and therefore floats on top of the fat column. 



The object of using glymol is to remove the meniscus or curve 

 present at the top of the fat column. This curve, owing to refrac- 

 tion of the light, is indistinct and renders correct reading difficult. 

 When a few drops of glymol are placed on top of the fat column, 

 the meniscus disappears and a straight, sharply defined line is formed 



Fig-. 100. Beading 1 Cream Test 



between the top of the fat and the bottom of the glymol. In this 

 condition the test can be read easily and accurately. 



For the best results the glymol should be added immediately 

 before reading. The glymol may be conveniently transferred to 

 the test bottle from a pipette, burette, or by squirting from a small 

 oil can. 



