The exceedingly bitter taste is a satisfactory proof that picric acid is deposited on the fibers. YELLOW DYE PBODUCED BY ANNOTTO.—In order to dye 10 lbs. of silk, lb. of annotto is boiled for ...

Acid Dyes are dyes that contain one or more acidic groups, such as the sulfo group, which is primarily utilized in acid solution to colour wool and silk. It is used on textiles with low pH and is ...

This article was originally published with the title “ How to Dye Green with Picric Acid ” in Scientific American Magazine Vol. 13 No. 45 (July 1858), p. 360 doi:10.1038 ...