Scientific American 40, 26.6.1847
After the goods are finished in the logwood run them through a weak solution of the bichromate of potass, and then dry them. This may appear too simple a method for any effect, but a course of practice has fully tested the value of this simple means of fastening the color. Receipts recommending salts as a means of making colors permanent, cannot be trusted, as experience has given no proof of any more efficacy being in salt than in cold water.
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