An Introduction to the Chemistry of Plant Products volume 1
An Introduction to the Chemistry of Plant Products volume 1
Paul Haas
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3. Ammonium hydrate in small quantities removes the fluorescence; in excess, a yellowish-brown coloration results. 4. Caustic soda or potash in small quantities causes the red colour to disappear, the solution turning opalescent and yellowish-brown in colour ; on standing, a brownish precipitate comes down. 5. The solution is immediately decolorized by bleaching powder, bromine water or a solution of iodine in potassium iodide. 6. Mercuric chloride solution in small quantities gives a lilac-gre...y precipitate, the solution then being yellowish in colour. * See Section VIII. , on the Colloidal State. 17 258 PIGMENTS 7. Ferric chloride gives a pinkish-brown precipitate. 8. Boiled with nitric acid a yellow colour results which turns to orange on adding an excess of ammonia. 9. Boiled with Millon's reagent a deep red colour results. 10. The addition of a caustic soda solution followed by a drop or two of dilute copper sulphate gives a greenish tint. 11. Digestion with pepsin, in the presence of hydrochloric acid, has no result.
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