N-Ethyl-N-(2-hydroxy-3-sulfopropyl)-3-methylaniline, sodium salt, dihydrate. New trinder's reagents which are highly water soluble aniline derivatives are widely used in diagnostic assays and biochemical detection. These reagents have several advantages over conventional chromogenic reagents in the colorimetric determination of hydrogen peroxide activity. Protect from Light and moisture. Highly water soluble, aniline analogs, wide pH range in colour development and oxidization reactions.