This section is from the "A Handbook of Useful Drugs" book, by State Medical Examining and Licensing Boards.
A mixture of tar (50 gm.) with yellow wax and lard sufficient to make 100 gm.
This should be diluted from 10 to 20 times before application. In chronic conditions, scaly eruptions, psoriasis and ringworm it may be applied in full strength.
 
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