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Updated: May 9, 2025
By heating under pressure with acetic acid, however, silk is completely dissolved. Silk is also dissolved by strong sulphuric acid, forming a brown thick liquid. If we add water to this thick liquid, a clear solution is obtained, and then on adding tannic acid the fibroïn is precipitated. Strong caustic potash or soda dissolves silk; more easily if warm.
These insoluble compounds, however, have sufficient acid-affinity left in the combined tannic acid to unite also with the basic aniline colours, forming very fast or insoluble colour lakes. This principle is extensively used in practice to fix basic aniline colours, especially on cotton.
It is a beverage that I do not as a rule care much for. What particular variety of tea is it?" "It is the very best quality of Ceylon. I have forbidden the use of any other kind by my patients. The Ceylon tea possesses little or no tannic acid, and is not nearly so deleterious to weak stomachs as other varieties.
Large, cake-like spleens were greatly reduced by local applications of tincture of iodine, and the internal administration of small doses of quinine and iodine of potassium. Chronic diarrhoea yielded readily to a few doses of castor oil, followed by opium and tannic acid. Acute and chronic dysentery was treated by ipecacuanha, followed by astringents.
At a little distance the three passengers made their own preparations for lunch. Natalie, serenely trusting in Garth, put aside all anxiety about the outcome of their journey; and was frankly interested and amused. "Mercy!" she exclaimed. "They'll all die of tannic poisoning! And look what they eat! The bacon is as green as arsenic!"
Congested brain and lungs; redness of the mucous membrane of the stomach. The stomach and intestines should be examined for fragments of the leaves and fruit, recognized by their microscopical appearances. Treatment. Emetics, tannic acid or gallic acid. Diffusible stimulants. Method of Extraction from the Stomach. Use Stas-Otto process. Tests. The mousy odour.
Never boil any tea but English-breakfast tea; for all others, simple steeping gives the drink in perfection. A disregard of these rules gives one the rank, black, unpleasant infusion too often offered as tea; while, if boiled in tin, it becomes a species of slow poison, the tannic acid in the tea acting upon the metal, and producing a chemical compound whose character it is hard to determine.
Boiling liberates the tannic acid of the tea, which acts upon the tin, making a compound bitter and metallic in taste, and unfit for human stomachs. The best coffee is made from a mixture of two-thirds Java and one-third Mocha; the Java giving strength, and the Mocha flavor and aroma. The roasting must be very perfectly done.
After plugging the nares thoroughly with absorbent cotton dusted with tannic acid he was surprised to see the blood ooze out around the eyelids and trickle down the cheeks. This oozing continued for the greater part of an hour, being controlled by applications of ice to both sides of the nose." "Dr.
We must seek for an acid or acid body to use as mordant for our basic colour, and an acid or acid body that will form an insoluble precipitate or colour-lake with the dyestuff. An acid much used, and very valuable for this purpose, is tannic acid.
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