88 



Testing Milk and Its Products. 



-o 



the fat column change the curved surface of the menis- 

 cus into a straight line. Amyl alcohol, fat-saturated 

 alcohol and glymol have been suggested for this pur- 

 pose. 



Amyl alcohol colored red by fuchsin was suggested 

 by Eckles. 1 This may dissolve some of the fat and thus 

 cause a slightly low reading. Fat-saturated alcohol" 

 largely overcomes this objection. It is made by adding 

 about a teaspoonful of butter to six ounces of dena- 

 tured or wood alcohol in a stoppered bottle. This is 

 warmed slightly and shaken until the alcohol does not 

 dissolve any more of the fat. A small amount of 

 coloring matter may be added to 

 this solution to further facilitate 

 the reading. The use of glymol 3 or 

 white mineral typewriter and sew- 

 ing machine oil was suggested by 

 Hunziker for reading cream tests, 

 after an exhaustive study of the 

 subject. Glymol may be colored 

 with alkanet root which can be ob- 

 tained from a druggist. One ounce 

 of alkanet root will color one quart 

 of glymol; this is done by placing 

 a small cheese cloth bag filled with 

 the alkanet root in the bottle of 

 glymol for one or two days. 

 A convenient way of adding alcohol, glymol, etc., to 

 the fat column after completing a test is to insert a 



1 N. Y. Produce Review, Aug. 8, 1908. 



Wis. Expt. Sta. Bui. 195, p. 6. 



Purdue, Ind., Expt. Sta. Bui. 145, vol. XV, p. 593. 



FIG. 26a. Showing the 

 use of fat-saturated 

 alcohol, glymol, etc., 

 for eliminating the 

 meniscus in cream 

 tests. 



