New Dye for Woolen Goods.

Scientific American 17, 21.10.1868

Tar water, it is asserted, may be employed for dyeing silk and wool with the color called gris cendre, or ash gray. The stuff is first mordanted with weak perchloride of iron, by soaking in the solution for some hours. It is then drained and passed through the bath of tar water. The oxyphenate of iron, which is thus precipitated on the fabric, gives a very solid color.