. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. Contribution from the Bureau of Chemistry CARL L. ALSBERG, Chief. ^•L^*^W<« July 26, 1918 AMERICAN SUMAC: A VALUABLE TANNING MATERIAL AND DYESTUFF. By F. P. Veitch, Chemist in Charge, and J. S. Kogers, Assistant Chemist, Leather and Paper Laboratory} Introduction Species of American sumac ,. Present methods of gathering and curin: Tannin content of American sumac Sumac extract Disposal of extracted material CONTENTS. Page. 1 3 5 8 9 10 Causes of poor quality in sumac Cooperation for better sumac Di
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. Contribution from the Bureau of Chemistry CARL L. ALSBERG, Chief. ^•L^*^W<« July 26, 1918 AMERICAN SUMAC: A VALUABLE TANNING MATERIAL AND DYESTUFF. By F. P. Veitch, Chemist in Charge, and J. S. Kogers, Assistant Chemist, Leather and Paper Laboratory} Introduction Species of American sumac ,. Present methods of gathering and curin: Tannin content of American sumac Sumac extract Disposal of extracted material CONTENTS. Page. 1 3 5 8 9 10 Causes of poor quality in sumac Cooperation for better sumac Directions for proper gathering and curing of sumac Buyers of sumac Summary INTRODUCTION. Sumac grows wild on uncultivated lands in a large part-of the United States, and is especially abundant and accessible east of the Mississippi River, from Maine to central Georgia and Mississippi. (See PL I.) Plentiful stands are found on cut-over land, in old fields, in pastures, on mountain sides, in waste places, and on the edges of swamps in the Appalachian region. Immense quantities of this valuable tanning and dyeing material, which costs nothing to raise, remain ungathered in this country every year, while vegetable tanning materials to the value of more than $5,000,000 ^ are im- ported annually. If the sumac industry were well organized, the large quantities of this native tannmg and dyeing material now wasted could be utilized m making leather and as a substitute for other dyes wherever practicable. This would serve to check the rising cost of similar tanning and dyeing materials, tc lessen our dependence on foreign countries, and to give the country people in certain sections an additional source of employment. Sumac has long been used hi the tanning of leather and in dyeing fabrics. Its value for tanning depends chiefly upon the fact that it yields durable, light-colored or white leathers, and, consecjuently, it is used largely in the tanning of bookbinding, glove, and hat band
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