Joint Collaborative Study of the Direct Microscopic Clump Count Method in Dry Milks and its Statistical Considerations

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Abstract
Between laboratories there was wide variation of the Direct Microscopic Clump Count, as applied to dry milks. Within laboratories results were generally fairly reproducible for all levels of count when using the Levowitz-Weber single solution stain; for the aniline oil-methylene-blue stain the average coefficient of variability was higher. The former gave higher counts than the latter. The reproducibility of results did not differ within or between laboratories when the DMCC procedure was applied to spray process nonfat dry milk, roller process nonfat dry milk and spray process dry whole milk.

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