Manufacturer and Builder 9, 1875
D. Elsner states that an indelible red ink can be prepared as follows: Equal parts, by weight, of copperas and cinnabar, both in fine powder and sifted, are rubbed up with linseed oil with a muller, and finally squeezed through cloth. The thick paste can be employed for writing or stamping woolen or cotton goods, and the color remains fast after the goods have been bleached. The reds usually employed are not fast colors, and do not resist the action of bleaching agents.
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