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RECIPES, DEVELOPERS FOR COLLODION EMULSION. Glycin. Dissolve 22 ozs. of sodium sulphite in 4 ozs. of water distilled (hot), and add i oz. of glycin and 5 ozs. of carbonate of potassium. The order of mixing as stated above should be care fully followed. The solution forms a thick paste, and will keep for years, if well stoppered. For use dilute:— i part of glycin paste with 12 parts of water. This forms the usual developer. Hydroquinone. A. Water, distilled 20 ozs. Sulphite of sodium 10 ozs. Carbonate of potash 8 ozs. B. Hydroquinone 1 oz. Water, distilled 4 ozs.