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To Dye with Hoffman's Purple

as this will make the fabric more susceptible to the color. Blues soluble in water color The dye is prepared as other purples. (See more casily than those which have to be dis- No. 2607.) Some authorities maintain that this color does not require the addition of acid solved in alcohol.

2603. To Dye Silk or Wool with Ani- to the dye bath, but the color is apt to rub line Blue. In this manner are used the va- off when dyed in this manner. A trace of rieties of aniline blues known as Bleu de Lyon, tartar, or of tartaric, oxalic, or any vegetable Pure Blue, Red Blue, and all others soluble in acid may be used with advantage; but minmay be used with advantage; but minalcohol. Into a stone jar fitted with a cover, eral acids are to be particularly avoided. The through which a hole is made to admit a stick bath should be kept at a boiling temperature. 2609. To Dye Woolens Blue with are merely immersed in the bath until they Aniline. To the water in the vat sulphuric have taken up sufficient of the color; it is not acid is added in sufficient quantity to cause it always advisable to work them about while in to taste as acid as vinegar; it is then brought the bath. to boiling, and kept so for 10 minutes; some blue aniline liquor is then added with stirring; the goods are submerged, and kept under while boiling until the water has lost its color; after which they are removed, fresh liquor is added, and the process continued until the desired color has been given, the water being kept constantly at a boil. (See No. 333.)