YELLOW MINERAL PIGMENTS.

155

Chrome- or Canary-Yellow.

are added 2 lbs. of acetate of lead, the mixture being stirred until solution iscomplete. The deposit is allowed to subside, and the clear liquor, whichshould stand at 27° Tw., strained off. This standard liquor is, in the shadegiven in the specimen, mixed in the proportion of 1 measure (at 27° Tw.), to3 measures of a solution of gum substitute at 5 lbs. to a gallon. The mixtureis printed on the cloth, which is dried, and the colour is raised (or developed)by passing the fabric through a cold solution of soda-ash at 12° Tw. for twominutes, when it is rinsed in water, washed, dried, and passed through a weaksolution of chloride of lime by the mangle, and again dried.

This colour is also known under the term of “rust” yellow. A darker shadeof rust-yellow generally used for warps for goods which are to be colouredPrussian blue, may be coloured in the yarn by the following method :—25 lbs. of clean cotton yarn are run through a bath of 3 lbs. of copperas

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