Century Dictionary and Cyclopedia
- n. An artificial dyestuff, first prepared in 1873 by fusing various vegetable and animal products, such as sawdust, bran, blood, and horn, with sodium sulphid. It dyes unmordanted cotton brown in a salt bath, and the color is fixed by an after treatment in a warm solution of some acid, as sulphuric, or a metallic salt, as copper sulphate or potassium bichromate. Various shades of a fast brown are produced, depending in character upon the after treatment. It is of interest as being the first of that important class of dyestuffs known as the sulphid colors.
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