The Analyst Volume 9

The Analyst Volume 9

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 edition. Excerpt: ...of copper arsenite (Scheele's green) per pound of coffee. The amount of lead present was not ascertained but it is now being estimated. The above amount of arsenite of copper would indicate the presence of about grains of Scheele's green, or about grains of arsenious acid, in each half ounce of the coffee, the quantity necessary to make up a cup of the beverage. I was informed that the coffee in question was produced in Central America, and was subjected in this city to some process, which altered its characteristics so as to cause it to resemble Java coffee. This process is as follows: The coffee in bag is subjected to a high degree of moist heat. This ripens or matures the berry, and is also said to extract from it a bitter substance known as caffeo-tannic acid. In ripening, the colour is changed from a green to a brown tint, the shade of brown boing lighter or darker, according to the length of time the coffee is subjected to the maturing process. The process is analagous to what occurs in the hold of a vessel carrying coffee from Java. I can find nothing harmful in it, except that in the case of certain South American coffees, I am informed, it enables the dealers to sell them for Java. The light coloured Java coffees are also matured by the above method. Two advantages are claimed for this process: (1)it improves the drinking qualities of the coffees; (2) it enables the dealers to meet the demand for dark coloured coffees. The proprietor of the mill in which the coffee in question was treated admitted to me that, in addition to the maturing process, he had formerly used yellow-ochre to give the coffee a more uniform tint. Yellow-ochro is a ferruginous earth, and is produced in nature by the decomposition of iron pyrites. It is a well-known...show more

Product details

  • Paperback | 142 pages
  • 189 x 246 x 8mm | 268g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236641507
  • 9781236641502