2606. To Dye with Alkali Blue and Nicholson's Blue

2606.    To Dye with Alkali Blue and Nicholson's Blue. Dissolve 1 pound of the dye in 10 gallons boiling water. Add this, by small portions, to the dye bath, which should be rendered alkaline by borax. The fabric should be well worked about between each addition of the color; the temperature must be kept under 212° Fahr. If the right proportion of borax has been used the goods will show but little color when removed from the bath. To develop this, wash with water and pass through a bath containing sulphuric acid.

2607. To Dye with Aniline Violet and Purple

2607.    To Dye with Aniline Violet and Purple. The various aniline purples known as Parme, Violet de Fuchsin, Victoria Violet, and Amaranth, are used in the same manner as Bleu de Lyon (see No. 2603 (To Dye Silk or Wool with Aniline Blue)), omitting the sulphuric acid. Acidulate the bath by sulphuric acid, or use sulphate of soda; both these substances render the shade bluish. Dye at 212°. To give a fair middle shade to 10 pounds of wool, a quantity of solution equal to 1/2 to 3/4 ounce of the solid dye will be required. The color of the dyed fabric is improved by washing in soap and water, and then passing through a bath soured by sulphuric acid. According to Mr. Hirsch, cotton is treated as follows: Prepare the goods for fuchsine, and turn them over a few times in a tepid solution of 21/4 ounces crystallized per-chloride of tin, for every 10 pounds of goods. Remove the latter, add as much violet solution as the shade requires, dye for a quarter of an hour, wring well, and dry. Washing in a solution of alum and starch will render the color more solid.

2608. To Dye with Hoffman's Purple

2608.    To Dye with Hoffman's Purple. The dye is prepared as other purples. (See No. 2607 (To Dye with Aniline Violet and Purple).) Some authorities maintain that this color does not require the addition of acid to the dye bath, but the color is apt to rub off when dyed in this manner. A trace of tartar, or of tartaric, oxalic, or any vegetable acid may bo used with advantage; but mineral acids are to be particularly avoided. The bath should be kept at a boiling temperature.

2609. To Dye Woolens Blue with Aniline

2609.     To Dye Woolens Blue with Aniline. To the water in the vat sulphuric acid is added in sufficient quantity to cause it to taste as acid as vinegar; it is then brought 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 (Aniline Blue).)

2610. To Dye Silk Blue with

2610.    To Dye Silk Blue with. Aniline. Silk is steeped first for an hour in lukewarm water, acidulated with sulphuric acid, as for woolens in the last receipt, and the color must be added in 4 to 5 small portions, raising the temperature gradually to boiling, and continuing it at that, when a good color has been obtained, for some 5 to 10 minutes. The old bath is then replaced by fresh water, which is acidified with sulphuric acid, and in which the silk is boiled for 10 minutes; after which it is thoroughly washed in water and then in suds, afterwards again in water, then once more drawn through acidulated water, and lastly through water alone. (See No. 333 (Aniline Blue).)