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The results of the methylene blue test divide ice cream into four
categories — Grades 1, 2, 3, and 4. It is suggested that if ice cream
consistently fails to reach Grade 1 or 2 it would be reasonable to regard
this as indicating defects of manufacture or handling which
call for further investigation.
Repeated visits were made to premises from which unsatisfactory
results had been received, and communications were sent to the
Medical Officers of Health of the areas in which the ice cream was
manufactured. Further samples were taken from time to time. In
all. 157 visits to such premises were paid during the year.
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