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The glycerine may also be determined by the acetin or bichromate methods after driving off the alcohol and ether if so desired.

Hitherto, however, only two methods have been generally adopted, viz. the acetin and the bichromate processes.

The acetin method of Benedikt and Canton depends upon the conversion of glycerine into triacetin, and the saponification of the latter, and reduces the estimation of glycerine to an acidmetric method.

An approximation to the quantity can be obtained from the spread between the acetin and bichromate results on such distillates.