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Further Investigations with Adulterating Sulphuric Acid so as to Increase Babcock Test Reading^*

Division of Dairy Husbandry, University of Minnesota, St. Paul, Minnesota

ABSTRACT

Two years ago the writer¹ reported on the possibility of adulterating sulfuric acid so as to increase the reading of the Babcock test in which such acid was used. That report was on a temporary emulsion of a fat solvent saturated with butterfat and thoroughly shaken with acid. This adulteration did not materially affect the appearance of the acid, but on standing for more than an hour, the fat saturated solvent would separate out and accumulate on top of the acid, in which condition duplicate tests would not check and consequently adulteration would be suspected.

Since that report, the writer has been able to secure an acid emulsion that is stable and that will increase the Babcock reading when such acid is used. One sample of such an emulsion made up on December 15 has stood without agitation, and on May 5 shows no signs of separation. This sample was made up of 400 cc. sulfuric acid, specific gravity 1.83, 16 cc. fat saturated benzine, and 6 cc. water soap solution (Palmolive china soap, 1 part, and water, 2 parts).

^* Published with the approval of the Director as Paper No. 621, Journal Series, Minnesota Agricultural Experiment Station.

¹ W. E. Petersen, JOURNAL of DAIRY SCIENCE, vii no. 4 (1924).