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The Adulteration of tea. --In the London Lancet, of August 10th, we find the report of the microscopical and chemical analysis of forty-eight samples of tea. Of the twenty-four specimens of black tea analyzed, every one was found to be genuine. Of the like number of green teas all were adulterated. The adulterations are mainly a coloring matter with which the tea leaf is faced, painted or glazed. Ferro cyanide of iron or Prussian blue, is the article most commonly used for this purpose. Sometimes, however, indigo, kaolin, or China clay, and turmeric powder were found in addition. That species of tea which is denominated gunpowder, is adulterated in other ways by admixture with leaves not those of tea, with paddy husk, and particularly with "lie tea," so called, a leaf which resembles the tea leaf closely, and is sent to this country from China in vast quantities, to be employed in adulterations here. The coloring of the tea is almost entirely done in China, and probabl