THEindicators recommended by the Association of Official Agricultural Chemists for use in the determination of nitrogen by the Kjeldahl method are methyl red (pH range 4.4 to 6.0) and cochineal (pH range 4.8 to 6.2). Methyl orange is occasionally used, but its pH range of 2.9 to 4.0 is somewhat too low to be satisfactory, Each of these three indicators changes from red to yellow, with an intermediate orange color, and there is often a difference of opinion between individuals as to the exact end point.A new indicator, benzoyl auramine G, which is somewhat more satisfactory than any of these, is obtained by benzoylating the free base of auramine G [Colour Index No. 655 (8), Schultz (7th ed.) No. 752 (5)], which is the hydrochloride of 4,4'-dimethyldiamino-3,3'-dimethylbenzophenonimine, and is used in textile dyeing [not to be confused with the more common auramine O, a homologous dye (Colour Index No. 656, Schultz (7th ed.) No. 753)].