»Prepare Coal Tar Topical Solution as follows.

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