Experiment 1.
Ortho toluidine was suspended in water and conc. sulphuric acid added with vigorous stirring until all the amine had dissolved. The solution was heated to boiling until the sulphate had dissolved, and then cooled and the crystals thus obtained filtered off and dried. This was then powdered and ground with some powdered oxalic acid. These mixtures with and without oxalic acid were then baked until a sample was completely soluble in sodium hydroxide. The mass had become a deep grayish purple. It dissolved in water to give a deep red solution. Nothing satisfactory was obtained from any of these bakes, the formation of a red dyestuff as mentioned by Nevile and Winther seeming to be formed in a great quantity and very easily. Hence this method was discarded.