Tannin content of English walnuts : thesis ...
Present methods for the production of leather from animal hides still depend from the most part on the use of natural tannin extracts. During the year, 1952, the amount of natural tannin extracts used by the leather industry was 560,452,119 pounds as compared to 35,793,000 pounds of synthetic tanning materials. It is not as yet possible to produce synthetic materials as economically as the natural extracts; the result being that there is still a very great demand for natural tannin extracts. The need for finding new domestic sources of tannins is apparent when the amounts of domestic and imported extracts are compared. During the period 1940-1950, only 744,394,560 pounds of natural tannin extracts were produced domestically as compared to 1,579,244,280 pounds of tannin extracts which were imported. Tannins are known to occur in various parts of plants and they are also known to occur in the majority of the members of the plant kingdom. The purpose of this research is to investigate the feasibility of utilizing parts of the walnut tree as a source of tannins.
Tannins, Walnut, English, Agriculture, Chemistry, Plant Sciences
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