Dyeing the Yellow of Picric Acid and Naphthylamine on Wool.

Practical Magazine 20, 1876

(Chemistry applied to the Arts, Manufactures, &c.
Dyeing, Calico Printing, Bleaching, Tanning, and Allied Subjects.)

To produce the yellow of picric acid and that of naphthylamine on wool, take for 220 lbs. of woollen yarn,
14 oz. of picric acid,
2.2 lbs. of Glauber's salt,
2.2 lbs. of alum,
5¼ oz. of sulphuric acid.

These substances are to be dissolved in hot water raised to boiling point. The yarn should be put into this bath at the tem rature of about 104°Fahr. It should then be boiled for an our and lightly washed, the desired tone being developed in a bath of naphthylamine yellow.

- Technologiste, June 17, 1876.

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