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 . Fig. .59.—Compositesample bottle. Fig. 60 —Composite samples and rackto hold sample jars. much bichromate of potash is added, the sulphuric acid addeddigests the curd with difficulty. When the sulphuric acid isadded the curd is precipitated into a heavy, gray-colored coag-uluni, which dissolves with difficulty in the acid. According to the authors experience, corrosive sublimatetablets can be highly re
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 . Fig. .59.—Compositesample bottle. Fig. 60 —Composite samples and rackto hold sample jars. much bichromate of potash is added, the sulphuric acid addeddigests the curd with difficulty. When the sulphuric acid isadded the curd is precipitated into a heavy, gray-colored coag-uluni, which dissolves with difficulty in the acid. According to the authors experience, corrosive sublimatetablets can be highly recommended. The tablets contain acolor, which, when dissolved, colors milk, so that it can readilybe distinguished 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 obtainedfrom any creamery-supply house. During the winter, when the samples are kept comparativelycold, less preservative is needed than in the summer. One. 102 BUTTER-MAKING. corrosive sublimate tablet will keep a half-pint to a pint ofmilk or cream in good condition for about two weeks in summer,and about three weeks in winter, providing the sample is properlycared for. Some makers are practicing testing at the end ofevery month during the winter, and every two weeks duringthe summer. Testing at the end of every month saves labor,but it is not a reliable method to follow under all conditions,as some of the samples are likely to be somewhat impairedafter standing so long. Arrangement of Composite Samples.—Pint glass jars withcovers are, so far as known, the most convenient vessels touse for composite samples. Shelves should be arranged in theweighing-room on which to keep the bottles. If possible, itis best to have them in a case closed with glass shding is neat, and, if the glass doors fit weh, the samples are insome iTieasure protected in case of quick, unexpected changesin temperature. Thes
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