IDENTIFICATION
A. Dissolve 0.1 g in 2.5 ml of water R and heat with 2.5 ml of cupri-tartaric solution R. A red precipitate is formed.
B. Dip, for 1 s, a suitable stick with a reactive pad containing glucose-oxidase, peroxidase and a hydrogen-donating substance, such as tetramethylbenzidine, in a 5 g/I solution of the substance to be examined. Observe the colour of the reactive pad; within 60 s the colour changes from yellow to green or blue.
C. It is a clear, colourless or brown viscous liquid, miscible with water. The substance may partly or totally solidify at room temperature and liquefies again when heated to 50 °C.