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Using the three recognized methods for d etermining the nonvolatile content of shellac varnish, 70 vamishes , made by cutting 33 dry orange shellacs and 6 dry bleached shellacs in 5 different solvents, were examined and a summary of the results was prepared. This summary shows: (1) That the method given in Federal Specification TTV91 is most convenient and simple in operation, and that thc results obtained thereby are in closer agreement than those obtainecl by the methocls given in the specifications of the American Society for T esting Materials and of the U. S. Shellac Importers Association, Inc.; (2) That the presence of volatile matter in dry shellac and the use of solvents with high end points influence , decidedly , the nonvolatile determination; and (3) That, in calculating the "cut" of a shellac varnish, a positive correction must be made to the percentage of nonvolatile residue for the volatile content of the dry shellac determined at 105° C. CONTENTS Page

Determination of nonvolatile matter and the calculation of "cut" of shellac varnish