. Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families. ash. The aqueous solution ofthe ash is evaporated, gently ignited, andweighed. Genuine tea contains not less than3 per cent, of soluble ash, while in exhaustedleaves this item falls as low as 052 per S represents the percentage of soluble ash,the perce
. Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families. ash. The aqueous solution ofthe ash is evaporated, gently ignited, andweighed. Genuine tea contains not less than3 per cent, of soluble ash, while in exhaustedleaves this item falls as low as 052 per S represents the percentage of soluble ash,the percentage of exhausted leaves E may beapproximately found in the absence of foreignleaves by the equation : E = (6—2S) 20. (5) Foreign leaves. The presence of leaves,other than those of the tea plant, may be de-tected with some accuracy by estimating theinsoluble matter, tannin, gum, and ash; butthe microscope must decide this question. 3. Adulterants for imparting a fictitiousstrength, (a) Extraneous tannin matters,such as catechu, &c., are detected by an un-usually high percentage of tannin, as indi-cated by the lead process. Tea, adulteratedwith catechu, gives an infusion which quicklybecomes muddy on cooling. 1 gram of the sam-ple and 1 gram of pure tea are each infused in100 of water, and the solutions poured TEA 1633. Leaves and stalks of best tea hrouglit from China (1861) by private hand. Natural size. Generally in commercial tea the leaves are much larger and thicker, and often are cut traiisversely into tWv ortiiiUee parts. Some stalks and remains of flowers are found in all tea, eveu the best.
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