Dye wool yellow or orange. SECTION I.-Hydrochloric acid added to strong acidification precipitates the color or decolorizes the solution (the nitro colors). Group I.-Color extracted by ether from solution acidified with hydrochloric acid. Victoria yellow (2). Martius yellow (3), water solution plus potassium cyanid gives a brown color on warming. Group II.-Color not extracted by ether from solution acidified with hydrochloric acid. Naphthol yellow S (4). SECTION II.-Hydrochloric acid causes a decided change in the color of the water solution (many of the tropoolins). Group I.-Hydrochloric acid turns dyed wool violet. Dyed wool is yellow. Brilliant yellow S (Sch.) (89), dyed wool is yellow turned violet by hydrochloric acid. Metanil yellow (Sch.) (95), dyed wool is orange yellow turned violet by hydrochloric acid. Group II-Hydrochloric acid turns dyed wool brown. Chrysoidin R (18). This color is absorbed by fuller's earth and partially absorbed by aluminum hydroxid. Group III.-Hydrochloric acid turns dyed wool red. Fast yellow (8). SECTION III.-Color of water solution not decidedly changed by hydrochloric acid. (If a precipitate appears only a part of the color is precipitated.) Dyed wool is yellow. Naphthol yellow S (4), dyed wool is decolorized by hydrochloric acid. Tartrazin (94), color of dyed wool not changed by hydrochloric acid. Dyed wool is yellow orange to orange. Tropoolin O (84). Tropoolin 000 (85). Orange G (14). Dyed wool is red orange. Mandarin G (86), dyed wool is turned red violet by hydrochloric acid or sulphuric acid. Ponceau 4 G. B., color of dyed wool not changed by hydrochloric acid nor by sulphuric acid. COLORS OF CLASS II. Solution decolorized by stannous chlorid, original color returns on addition of hydrogen dioxid. (Bismarck brown, which might be referred to this class, is included under Class I.) (1) Dyes wool and cotton bluish red (most readily from an alkaline bath). Safranin (584), much hydrochloric acid turns water solution blue violet. Color absorbed by fuller's earth, precipitated by tannin reagent. Sulphuric acid turns dyed wool green, solution green, hydrochloric acid blue. (2) Dyes wool blue from alkaline or neutral bath, cotton a paler blue from neutral bath. Methylene blue (650), color absorbed by fuller's earth precipitated by tannin; hydrochloric acid turns dyed wool robin's-egg blue, sulphuric acid green. COLORS OF CLASS III. Stannous chlorid produces no further effect on the color than hydrochloric acid. Sodium hydroxid produces a precipitate or decolorizes the solution. All the colors given in this class except auramin (425) are decolorized by sodium bisulphite reagent. The color reappears on heating and disappears on cooling. With the exception of acid magenta (A) (462) they are all absorbed by fuller's earth. Dye wool red. (1) Dye wool from acid bath only, do not dye unmordanted cotton in either bath. Acid magenta (462), color absorbed by aluminum hydroxid. Dyed wool is decolorized by hydrochloric acid, sulphuric acid, sodium hydroxid, or ammonium hydroxid. Tannin reagent gives no precipitate. (2) Dyes wool and also unmordanted cotton most readily from a neutral bath. Fuchsin (448), color not absorbed by aluminum hydroxid. Dyed wool turned red brown by hydrochloric acid or sulphuric acid. Tannin reagent gives a precipitate. (3) Dyes wool yellow from neutral or alkaline bath. Does not dye unmordanted cotton. Auranin (425). Dye wool green. Dye from acid bath: Guinea green B (A) (433) and acid green (434) do not dye cotton. Dye from neutral or alkaline bath: Ethyl green (428) dyes unmordanted cotton more readily than malachite green. Malachite green (427), dyed wool is blue green, turned at first grass green by hydrochloric acid or sulphuric acid, then yellow; on dilution, blue. Dye wool violet from neutral or alkaline bath. Methyl violet (451), sodium hydroxid gives a brown precipitate and brown solution. Ethyl violet (453), sodium hydroxid gives a white precipitate, colorless on warming. Either dyes unmordanted cotton from alkaline bath. Dyes wool blue from acid bath. China blue (480), color absorbed by aluminum hydroxid. Solution decolorized by sodium bisulphite reagent. Color does not readily return on heating, but does return on adding a drop of hydrochloric acid. Dyed wool decolorized by ammonium hydroxid, turned reddish brown by sulphuric acid. COLORS OF CLASS IV. Colors not reduced by stannous chlorid. Solution not decolorized and color not completely precipitated by sodium hydroxid. Dye wool red from neutral bath. Dyed wool is red orange to orange red: Eosin (512), color not absorbed by fuller's earth nor by aluminum hydroxid. Water solution yellow to orange with green fluorescence. Hydrochloric acid or sodium bisulphite reagent gives an orange precipitate. Dye wool bluish red from neutral bath: (a) Color completely absorbed by fuller's earth. Sodium bisulphite reagent gives no precipitate, but causes only a loss of fluorescence. Rhodamin G (502), water solution red violet with red fluorescence. Rhodamin B (504), water solution bluish red with orange brown fluorescence. (b) Color only partially absorbed by fuller's earth. Sodium bisulphite reagent precipitates the color. Erythrosin (516), water solution cherry red. (Green's tables give no fluorescence. A sample marked "Grübler" gave green fluorescence.) Hydrochloric acid gives an orange brown precipitate. Sodium bisulphite reagent gives an orange-red precipitate. Rose bengal (520), water solution cherry red. No fluorescence. Hydrochloric acid gives a brown-red precipitate. Sodium bisulphite reagent a pink precipitate. Phloxin (521), water solution bluish red with green fluorescence. Hydrochloric acid gives an orange precipitate. Sodium bisulphite a pink precipitate. OFFICERS, REFEREES, AND COMMITTEES OF THE ASSOCIATION OF OFFICIAL AGRICULTURAL CHEMISTS FOR THE YEAR 1908-9. President. W. D. BIGELOw, Washington, D. C. Vice-president. W. A. WITHERS, Raleigh, N. C. Secretary. H. W. WILEY, Washington, D. C. Additional members of the executive committee. E. F. LADD, Fargo, N. Dak. E. B. HOLLAND, Amherst, Mass. Referees. Phosphoric acid: W. F. Hand, Agricultural College, Miss. Determination of nitrogen: C. H. Jones, Burlington, Vt. Separation of nitrogenous bodies: P. F. Trowbridge, Columbia, Mo. (meat proteids). Potash: B. B. Ross, Auburn, Ala. Soils: S. D. Averitt, Lexington, Ky. Dairy products: J. M. Bartlett, Orono, Me. Foods and feeding stuffs: J. P. Street, New Haven, Conn. Food adulteration: H. E. Barnard, Indianapolis, Ind. Sugar: A. H. Bryan, Washington, D. C. Tannin: F. P. Veitch, Washington, D. C. Insecticides: C. C. McDonnell, Washington, D. C. Inorganic plant constituents: F. W. Robison, Lansing, Mich. Associate referees. Phosphoric acid: H. D. Haskins, Amherst, Mass. Determination of nitrogen: J. W. Kellogg, Harrisburg, Pa. Potash: Milk and cheese: G. E. Patrick, Washington, D. C. . E. L. Baker, Geneva, N. Y. Jas. A. Bizzell, Ithaca, N. Y. (special associate referee on available potash). Soils: J. G. Lipman, New Brunswick, N. J. Dairy products: L. G. Michael, Ames, Iowa. Foods and feeding stuffs: F. W. Morse, Durham, N. H. Colors: H. M. Loomis, Seattle, Wash. Saccharine products: Chas. D. Howard, Concord, N. H. Wine: Julius Hortvet, St. Paul, Minn. Beer: H. E. Barnard, Indianapolis, Ind. Distilled liquors: L. M. Tolman, Washington, D. C. Flavoring extracts: E. M. Chace, Washington, D. C. Spices: A. F. Seeker, New York, N. Y. Baking powders and baking chemicals: Edmund C. Clark, Boston, Mass. Meat and fish: F. C. Weber, Washington, D. C. Fats and oils: T. J. Bryan, Chicago, Ill. Dairy products: Hermann C. Lythgoe, Boston, Mass. Cereal products: E. F. Ladd, Agricultural College, N. Dak. Vegetables: W. L. Dubois, Buffalo, N. Y. Condiments other than spices: H. E. Bishop, Indianapolis, Ind. Tea and coffee: A. G. Woodman, Boston, Mass. Preservatives: P. B. Dunbar, Washington, D. C. Determination of water in foods: P. F. Trowbridge, Columbia, Mo. Sugar: Molasses methods: H. P. Agee, New Orleans, La. Chemical methods: A. H. Bryan, Washington, D. C. Tannin: C. F. Sammet, Washington, D. C. Insecticides: Howard R. Watkins, Washington, D. C. Inorganic plant constituents: O. M. Shedd, Lexington, Ky. Medicinal plants: H. H. Rusby, New York, N. Y. SPECIAL COMMITTEES. Food standards. Mr. William Frear, State College, Pa., chairman. Mr. H. W. Wiley, Washington, D. C. Mr. H. A. Weber, Columbus, Ohio. Mr. M. A. Scovell, Lexington, Ky. Mr. E. H. Jenkins, New Haven, Conn. Fertilizer legislation. Mr. H. W. Wiley, Washington, D. C., chairman. Mr. B. W. Kilgore, Raleigh, N. C. Mr. H. B. McDonnell, College Park, Md. Mr. J. L. Hills, Burlington, Vt. Mr. B. B. Ross, Auburn, Ala. Testing chemical reagents. Mr. L. F. Kebler, Washington, D. C., chairman. Mr. A. L. Winton, Chicago, Ill. Mr. B. W. Kilgore, Raleigh, N. C. Committee to present the question of the unification of terms to the International Congress of Applied Chemistry. Mr. R. J. Davidson, Blacksburg, Va., chairman. Mr. C. G. Hopkins, Urbana, Ill. Mr. W. D. Bigelow, Washington, D. C. Mr. G. S. Fraps, College Station, Tex. Mr. B. W. Kilgore, Raleigh, N. C. Mr. H. J. Wheeler, Kingston, R. I. Mr. J. T. Willard, Manhattan, Kans. Committee on standardization of alcohol tables. Mr. L. M. Tolman, Washington, D. C., chairman. Mr. M. E. Jaffa, Berkeley, Cal. Mr. A. B. Adams, Washington, D. C. Mr. R. J. Davidson, Blacksburg, Va. Mr. H. E. Barnard, Indianapolis, Ind. Committee on the unification of methods of analysis of fats and oils. Mr. L. M. Tolman, Washington, D. C., chairman. Mr. P. H. Walker, Washington, D. C. Mr. A. Lowenstein, Chicago, Ill. Standing committee on recommendations of referees and revision of methods. (The figures in parentheses refer to number of years appointee is to serve.) Committee A: B. B. Ross (3), J. P. Street (2), J. K. Haywood (1), chairman, Bureau of Chemistry, Washington, D. C. Committee B: E. M. Chace (3), F. W. Woll (2), chairman, Agricultural Experiment Station, Madison, Wis.; F. P. Veitch (1). Committee C: C. D. Howard (3), A. L. Winton (2), chairman, U. S. Food Inspection Laboratory, Chicago, Ill.; L. M. Tolman (1). |