(b) For Soluble Hide.—To a small portion of the clear non-tannin filtrate add a few drops of the filtered tannin solution. A cloudiness indicates the presence of soluble hide, in which case repeat the process described under VI., giving the hide-powder a more thorough washing.
The temperature of solutions shall be between 16° and 20° when measured or filtered. All dryings should be made in flat-bottomed dishes of at least 6 cm. diameter, S. and S. No. 590, 15 cm. filter paper should be used in all filtrations.
APPENDIX D.
The following Lists of Colours have been furnished by Mr. M. C. Lamb, Director of the Leather Dyeing Department of Herold’s Institute, London, who has devoted much time to testing the various dyes with regard to their permanence and suitability for leather. Many of the colours have also been tested and found satisfactory in the Leather Department of the Yorkshire College. The following abbreviations of makers’ names are used in the lists:—
| B. | Basler Chemische Fabrik, A. G. Basle, Switzerland. |
| B.A.S.F. | Badische Anilin und Soda Fabrik. Ludwigshafen a. Rhine, Germany. |
| Ber. | Berlin Aniline Co. Berlin S.O., Germany. |
| B.S. Spl. | Brooke, Simpson & Spiller. Atlas Dye Works, Hackney Wick, London, N.E. |
| By. | Farben-fabriken, late Bayer & Co. Elberfeld, Germany. |
| C. | L. Cassella & Co. Frankfort a. Main, Germany. |
| C.A. | French Aniline Colour Works. Vieux-Conde (Norde), France. |
| C. & R. | Claus & Rée. Clayton, near Manchester. |
| D. | Dahl & Co. Barmen, Germany. |
| D. & H. | Durand, Huguenin & Co. Basle, Switzerland. |
| G. | R. Geigy & Co. Basle, Switzerland. |
| Ger. | Gerber & Co. Basle, Switzerland. |
| K. | Kalle & Co. Bierbrich a. Rhine, Germany. |
| Leon. | A. Leonhardt & Co. Muhlheim a. Main, Germany. |
| Leitch | J. W. Leitch. Milnsbridge Chemical Works, Huddersfield. |
| Lev. | Levinstein Ltd. 21 Minshull Street, Manchester. |
| M.L.B. | Meister, Lucius & Bruning. Hoechst a. Main, Germany. |
| Mo. | Gilliard, P. Monnet & Gartier. Lyons, France. |
| N. | Noetzel, Istel & Co. Griesheim a. Main, Germany. |
| O. | K. Oehler & Co. Offenbach a. Main, Germany. |
| P. | St. Denis Dyestuff Co., late Pourier. St. Denis, near Paris. |
| R. | Sociéte Chimique des Usines du Rhone. Lyons, France. |
| R. H. & S. | Read, Holliday & Sons. Huddersfield. |
| S.C.Ind. | Society of Chemical Industry. Basle, Switzerland. |
| Uer. | Chemische Fabriken. Uerdingen a. Rhein, Germany. |
| W. Bros. | Williams Bros. & Co. Hounslow, Middlesex. |
STAINING.
Single Acid Dyes suitable for Staining Vegetable Tanned Leather.
Browns.
- Solid brown. (M.L.B.)
- Acid brown. (W. Bros.)
- Brown A2. (B.S. Spl.)
- Brown A1. (B.S. Spl.)
- Mikado brown B. (Leon.)
- New acid brown. (B.S. Spl.)
- Bronze acid brown. (By.)
- Golden brown Y. (C.), (By.)
- Acid anthracene brown R. (By.)
- Fast brown N. (B.A.S.F.)
- Nut brown A. (C.)
- Fast brown. (By.)
- Fast brown G. (Ber.)
- Resorcin brown. (Ber.)
- Resorcin brown. (D.)
- Acid brown. (Ber.)
- Dark nut brown. (W. Bros.)
- Acid brown R. (C.)
- Acid brown R. (Uer.)
- Acid brown R. (R. H. & S.)
- New golden brown A1. (C.)
- Dark brown. (C.)
- Acid brown L. (B.A.S.F.)
- Acid brown D. (C.)