2601. To Dye with Picric Acid

2601.    To Dye with Picric Acid. Dissolve 1 pound picric acid in 1 gallon of alcohol specific gravity .8200. The dye bath requires no addition, or special precaution. This color is used to produce shades of lemon and canary which cannot bo attained by the aniline yellow or phosphine. Its chief use is for dyeing green. For this purpose pass the fabric through a bath containing sulphuric acid and alum, adding, after thorough immersion, a sufficient quantity of solution of picric acid and indigo extract (see No. 99 (To make Indigo Extract)) to produce the desired shade.

2602. To Dye with Aniline Blue

2602.      To Dye with Aniline Blue. To 100 pounds of fabric dissolve 11/4 pounds of aniline blue in 3 quarts hot alcohol; strain through a filter, and add it to a bath of 130° Fahr., also 10 pounds Glauber's salts and 5 pounds acetic acid. Enter the goods, and handle them well for 20 minutes; next heat it slowly to 200° Fahr.; then add 5 pounds sulphuric acid diluted with water. Let the whole boil 20 minutes longer, then rinse and dry. If the aniline be added in two or three proportions during the process of coloring, it will facilitate the evenness of the color. The blue, or red shade of blue, is governed by the kind of aniline used, as, there is a variety in the market. Hard and close-wove fabrics, such as braid, ought to be prepared in a boiling solution of 10 pounds sulphuric acid and 2 pounds tartaric acid before coloring with the aniline, as this will make the fabric more susceptible to the color. Blues soluble in water color more easily than those which have to be dissolved in alcohol.

2603. To Dye Silk or Wool with Aniline Blue

2603.    To Dye Silk or Wool with Aniline Blue. In this manner are used the varieties of aniline blues known as Bleu de Lyon, Pure Blue. Bed Blue, and all others soluble in alcohol, into a stone jar fitted with a cover, through which a hole is made to admit a stick for stirring, put l pound of the dye, 5 gallons alcohol specific gravity .8200, and 2 ounces sulphuric acid; apply the heat of a water bath and stir frequently. After allowing the mixture to cool, filter, and treat any undissolved residue with fresh alcohol until complete solution is effected. From 5 to 8 gallons will be required. The dye bath for wool should be rendered sour by sulphuric acid. Tin crystals may be used, in quantity equal to about 1/40 the weight of the wool, to improve the vivacity of the shade. The bath should be brought to the boiling point. For silk, prepare a soap bath, add the color, and put in the goods. "When dyed sufficiently, pass through a bath acidulated with sulphuric acid.

2604. To Dye Cotton with Aniline Blue

2604.     To Dye Cotton with Aniline Blue. Cotton is prepared as for magenta (see No. 2577 (To Dye Cotton Magenta)), and dyed in an acid bath as for wool. (See No. 2603 (To Dye Silk or Wool with Aniline Blue).)

2605. To Dye with Aniline Water-Blue

2605.    To Dye with Aniline Water-Blue. This color is quite soluble in water, and will answer well for preparing a liquid dye; 1 pound may be dissolved in a mixture of 1 gallon alcohol and 4 gallons water. Dyers dissolve the powder in the dye bath. The dye is used in the same way as Blonde Lyon. (See No. 2603 (To Dye Silk or Wool with Aniline Blue).)