using acetone to clean audio cassette heads
Adding to Dave's post - a bit of history:
"In 1906, President Theodore Roosevelt signed the Pure Food and Drug Act into law. The law elevated the public health role of the United States Pharmacopeia because it defined a drug as €śall medicines and preparations recognized in the United States Pharmacopeia (USP) or National Formulary (NF),€ť and defined adulterated drugs as those referenced in the USP and NF but differing from €śthe standard of strength, quality, or purity€ť specified in the two compendia. The practice of labeling medicines with the letters €śU.S.P.€ť or €śUSP€ť became more prevalent. In 1938, the Food, Drug and Cosmetic Act reaffirmed the role of the pharmacopeia and expanded its role to include USP standards for labeling and packaging. "
Peter Wieck
Melrose Park, PA
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