Y. Boil with dilute bichromate. Changes to dark maroon or violet black. Chromo tropes, Azofuchsine, &c. Some of the color is stripped and the wool becomes much bluer. Boil with hydrosulphite A. Color slowly changed to deep yellow. Original color not restored on exposure to air. No. 11 Cochineal Scarlet. Decolorized. Color is quickly restored on exposure 'to air. No. 12 Archil. Z. Little or no color is stripped. The cotton remains white or is stained. Boil with 5 per cent. sodium acetate and white cotton for two or three minutes. Cotton is stained-Salt dyestuff. Test ash for chromium. Chromium is absent. Treat fibre with conc. sulphuric acid. Red Solution-Rosophenine. Violet Red Solution-Erica or Geranine. Blue Solution-Diamine Fast Red. Greenish Blue Solution-Hessian Purple. Confirm by testing ash for metallic mordants. Boil with hydrosulphite A. Color not affected. Al in ash. No. 14 Cochineal Color slowly changed to yellow or orange. Al in Al in ash. Decolorized. Color is not restored by persulphate. Decolorized. Cr in ash. EXAMINATION OF VIOLET OR PURPLE SHADES. TABLE III. The fibre may be dyed with one of the following: 1. A basic violet of the azine, oxazine, or thiazine groups, such as Neutral Violet, Rhoduline Violet, Rosolane, Iris Violet, Tannin Heliotrope, Methylene Violet, &c. 2. A basic violet of the triphenylmethane group, such as Methyl Violet, Crystal Violet, Benzyl Violet, Regina Purple, &c. 3. An acid violet of the pyrone group, i.e., Fast Acid Violets or Violamines. 4. An acid violet of the triphenylmethane group, i.e., Acid Violets, Formyl Violets, &c. 5. An alkali violet of the triphenylmethane group. 6. A red shade soluble blue (triphenylmethane group). 7. An acid color of the azine, oxazine or thiazine groups, such as Induline or Fast Blue R. 8. An acid azo color, such as Lanacyl Violet, Victoria Violet, &c. 9. A salt dyestuff, such as Hessian Violet, Diamine Violet, Oxamine Violet, Benzo Fast Violet, Columbia Violet, Oxydiamine Violet, Chlorantine Violet, &c. 10. Galleine. 11. Alizarine or iron or chromium mordant. 12. Alizarine Bordeaux. 13. Mordant dyestuff of the oxazine group, such as Gallosyanine, Prune, Celestine Blue, &c. 14. Chrome Violet (mordant dyestuff of triphenylmethane group). 15. Mordant azo colors. ANALYSIS. Boil twice for one minute with 5 per cent. acetic acid. A. Color is nearly completely stripped. Basic dyestuff. Boil with hydrosulphite A. Decolorized. The color, returns on exposure to air. B. No. 1 Basic Violet of the Azine, Oxazine, or Thiazine Groups. Decolorized. The color only returns on oxidation with persulphate. Basic violet of Triphenylmethane Group, such as Methyl Violet. Color is not stripped-Acid, Salt and Mordant dyestuffs. Boil twice for one minute with aqueous alcoholic ammonia and white cotton. X. Much color is stripped but cotton remains white—Acid dyestuff. Boil with hydrosulphite A. Not altered or only partially decolorized-Pyrone The ammoniacal extract is violet or purple. No. 4 Ammoniacal extract is colorless but becomes violet on acidifying. Spot fibre with conc. HCL. Becomes green No. 5-Alkali Violet. No change-Red Shade Soluble Blues. Y. Little or no color is stripped. Cotton remains white or is tinted. Boil with sodium acetate and white cotton for two or three minutes. Cotton is stained-Salt dyestuff.. No. 9 Hessian Violet, Diamine Violet, &c. Cotton remains white-Mordant Color. Confirm by testing for metallic mordants in ash. Color not altered. Pyrone Group No. 10-Gallein. No. 13 Gallocyanine, Prune, Celestine Blue, &c. air, but is restored by oxidation with persulphate. No. 14 Chrome Violet. Decolorized. Color is not restored either by exposure to air or by oxidation with persulphate. No. 15 Mordant Azo Color. Color changed to brown-Alizarine Group. Boil with dilute HCL. Fibre and solution yellow. No. 11 Alizarine. Fibre and solution red or reddish brown-No. 12 Alizarine Bordeaux. EXAMINATION OF BLUE SHADES. TABLE IV. The fibre may be dyed by one of the following color-matters. 1. A basic dyestuff of the azine, oxazine, or thiazine group, such as Methylene Blue, Nile Blue, Capri Blue, Cresyl Blue, Meldola's Blue, &c. 2. A basic safranine-azo color, e.g., Indoine or Janus Blue. 3. A basic dyestuff of the triphenylmethane group, such as Victoria Blue, Night Blue, Brilliant Milling Blue B, &c. 4. Logwood Blue. 5. Indigo Extract or Indigo Carmine (indigo sulphonic acids). 6. Thiocarmine (thiazine group). 7. Prussian Blue. 8. A "Wool" Blue (triphenylmethane group). 9. A dyestuff on the " patent blue" class, such as Patent Blues V, A, or N, Cyanol, Cyanine, Ketone Blues, Erioglaucine, &c. (triphenylmethane group). 10. A soluble or Alkali Blue (rosaniline blue). 11. An acid azo blue, such as Lanacyl Blue, Azo Acid Blue, Azo Merino Blue, Azo Navy Blue, &c. 12. Acid Alizarine Blues (without mordant), such as Alizarine Saphirol, Alizarine Irisole, Alizarine Astrole. 13. A salt dyestuff, such as Diamine, Benzo, Chicago or Dianil Blues, Sulphone Cyanines, &c. 14. Indigo. 15. An Alizarine Cyanine or Anthracene Blue. 16. An Alizarine Blue (anthraquinonequinolines). 17. Brilliant Alizarine Blue (thiazine group). 18. Gallocyanines, Gallocyanine Blue, Celestine Blue, Prune, &c. (oxazine group). 19. Chrome Blue (triphenylmethane group). 20. A mordant azo dyestuff, such as Cyprus Blue, Peri Wool Blue, Anthracene Chrome Blue, Chromotrope Blue, &c. ANALYSIS. Boil twice for one minute with 5 per cent. acetic acid. A. Mucn color is stripped. Boil with dilute alcohol twice for one minute. Unaffected. Al or Cr or both are present in ash. Blue is changed to brick red on spotting with HCL. No. 4 Logwood Blue. Much color is stripped. Basic dyestuff. Boil with hydrosulphite A. Decolorized. Original color returns on exposure to air. Azine, Oxazine or Thiazine Group No. 1Methylene Blue, Nile Blue, Capri Blue, &c. Decolorized. Violet color returns on exposure to air. Safranine Azo Color No. 2-Indoine or Janus Blue. Decolorized. Color does not return on exposure to air, but is restored by persulphate. Triphenylthane Group No. 3-Victoria Blue, Night Blue, &c. B. Little or no color is stripped-Acid, Salt or Mordant dyestuff. |