Due to the failure of technicians to agree on their results, it is very difficult to obtain significant answers to problems of sanitation analysis through collaborative tests. Much of the reason for disagreement is individual differences in ability to count fragments and rodent hairs.

The paper describes a technique whereby these differences are smoothed out. Filter papers bearing residues from sanitation tests are embedded in a thin layer of paraffin and read collaboratively. The paraffin is melted while the filter paper is being read, and then solidifies, anchoring all particles in place.

In addition to giving more reliable results, the paraffin-coated slide technique has shown its self to be a good training medium.

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Author notes

1This is the third of a series of papers which were presented at the Second Conference on Problems of Extraneous Matter in Foods, arranged by Dr. J. D. Wildman, Department of Plant Science, Syracuse University, Syracuse, New York, and held at that university April 16, 1956.

Mr. Cory received the B.S. degree from the College of Puget Sound, Tacoma, Washington in 1931. Mr. Cory is Service Chemist for General Mills, Inc., at San Francisco. He has been very active in the field of Cereal Chemistry and has served as Chairman of the Sanitation Committee of the Pacific Northwest Section, American Association of Cereal Chemists as well as Chairman of the Sanitation Methods Committee of that organization.