. Principles and practice of butter-making : a treatise on the chemical and physical properties of milk and its components, the handling of milk and cream, and the manufacture of butter therefrom . Butter; Milk. 100 BUTTER-MAKING. account of its relative harmlessness, its cheapness, and efRciency. While bichromate of potash is relatively efficient in its preservative effect, and not so poisonous as some of the others, it does not give as general satisfaction as does corrosive sub- limate (mercuric chloride), unless relatively greater precau- tions are taken. If the composite samples preserved
. Principles and practice of butter-making : a treatise on the chemical and physical properties of milk and its components, the handling of milk and cream, and the manufacture of butter therefrom . Butter; Milk. 100 BUTTER-MAKING. account of its relative harmlessness, its cheapness, and efRciency. While bichromate of potash is relatively efficient in its preservative effect, and not so poisonous as some of the others, it does not give as general satisfaction as does corrosive sub- limate (mercuric chloride), unless relatively greater precau- tions are taken. If the composite samples preserved with bichromate of potash are left standing in the light very long, a leathery scum forms on the top, which is very difficult to dissolve in the sulphuric acid. This is claimed to be due to the reducing influence of light on chromate solutions. If too. Fig. 59.—Composite sample bottle. Fig. 60 —Composite samples and rack to hold sample jars. much bichromate of potash is added, the sulphuric acid added digests the curd -with difficulty. When the sulphuric acid is added the curd is precipitated into a heavy, gray-colored coag- ulum, which dissolves with difficulty in the acid. According to the authors' experience, corrosive sublimate tablets can be highly recommended. The tablets contain a color, which, when dissolved, colors milk, so that it can readily be distmguished as not being fit for human food. The tab- lets are very poisonous, but are more efficient in their preser- vative effect than bichromate of potash. They can be obtained from any creamery-supply house. During the winter, when the samples are kept comparatively cold, less preservative is needed than in the summer. One. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McKay, George Lewis; Larsen, Christian, 1874-. New York : J. Wiley & Sons
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
