The Chemical Gazette 331, 1.8.1856
By C. Pugh.
According to Pugh, silk, wool, &c., dyed with picric acid, do not change their colour by immersion in a hot solution of protochloride of tin or iron, although these are both very energetic reductive agents. But if, after washing, they are immersed in an alkaline solution, a red colour is produced in consequence of the formation of haematin-nitric acid; but this colour dissolves, and the stuff remains almost white. Perhaps by using certain mordants this would furnish a means of fixing red patterns upon yellow grounds.
—Journ. für Prakt. Chem., lxv. p. 368.
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