» Prepare Coal Tar Topical Solution as follows.

Mix the Coal Tar with 500 g of washed sand (see under Reagents in the section Reagents, Indicators, and Solutions), and add the Polysorbate 80 and 700 mL of Alcohol. Macerate the mixture for 7 days in a closed vessel with frequent agitation. Filter, and rinse the vessel and the filter with sufficient Alcohol to make the product measure 1000 mL.