抄録
The reducing mechanism of azo dyestuff has been indicated to be important for its carcinogenic process and the fading of the dye on fibre. The reducing process, however, makes difference by the formulla of azo compounds, the kinds of reducing agents and other conditions. To investigate those relations, the effects in the process were detected by the paper chromatography and the paper electrophoresis.
Such dyes containing the coupling components as crocein acid, G-acid, schaeffer acid and R-acid were used. Those azo compounds were attacked in the azo linkage to produce amine generally by stannous chloride, and hydrazo compounds in many cases by sodium sulfite. The good separation of the free dye and the hydrazo is caused by employing the developer of mixedsolution-buthanol, pyridine, water, 6:3:4-in the paper chromatography. Hydrazo compounds are not stable and reproducted the azo linkage easily by air oxidizing. The dye having R-acid produces twe amines by sodium sulfite.
