. Dairy chemistry; a practical handbook for dairy chemists and others having control of dairies. Agricultural chemistry; Milk. DETECTION OF BLOOD. 177 porcelain dishes. Unreduced colouring-matters will leave a coloured residue. A pink colour is usually due to the presence of blood; this may be detected by warming the milk to 50° C, and separating it in a high speed centrifuge (Fig. 15); if blood is present a bright red deposit is seen at the bottom of the tube. The deposit may be examined microscopically, and it is usually found that the blood-corpuscles have become considerably disintegrated,
. Dairy chemistry; a practical handbook for dairy chemists and others having control of dairies. Agricultural chemistry; Milk. DETECTION OF BLOOD. 177 porcelain dishes. Unreduced colouring-matters will leave a coloured residue. A pink colour is usually due to the presence of blood; this may be detected by warming the milk to 50° C, and separating it in a high speed centrifuge (Fig. 15); if blood is present a bright red deposit is seen at the bottom of the tube. The deposit may be examined microscopically, and it is usually found that the blood-corpuscles have become considerably disintegrated,. Fig. 15.—High-Speed 'ntrifuL:e. and have the appearance shown in the plate (Fig. 16). As a confirmatory test the residue should be treated with a drop of acetic acid on a microscope slide, a cover glass placed over the mixture, and the acetic acid gently evaporated over a very small rtame. When nearly dry, the slide should be examined with J-inch power, and the presence of brown rhomboid crystals of hoemin hydrochloride wUl indicate blood. Preservatives. — In order to check the growth of micro- 12. 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 Richmond, Henry Droop. London, C. Griffin & Company, Limited
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculturalchemistr
