Hydroquinone USP Coumarin and Derivatives 00% RATIO OF ABSORBANCES 1

00% RATIO OF ABSORBANCES 1

Test Specification Min Max EXPIRATION DATE

Test Specification Min Max ASSAY [(NH[@2@]OH)[@2@][-H[@2@]SO[@4@]] 98

Test Specification Min Max ASSAY 70 - 75% 70 - 75% pH OF A 10% SOLUTION 8

98% RETEST DATE

Hydroquinone USP Coumarin and Derivatives 00% RATIO OF ABSORBANCES 1Test Specification Min Max ASSAY (ANHYDROUS BASIS) 99 100. 50% MELTING RANGE 172?? 174?? RESIDUE ON IGNITION 0. 50% WATER DETERMINATION 0. 50% ELEMENTAL IMPURITIES AS REPORTED AS REPORTED IDENTIFICATION (A) TO PASS TEST TO PASS TEST IDENTIFICATION (B) TO PASS TEST TO PASS TEST IDENTIFICATION (C) TO PASS TEST TO PASS TEST RETEST DATE DATE OF MANUFACTURE APPEARANCE RESIDUAL SOLVENTS TO PASS TEST TO PASS TEST