Natural fur processed for jet-light w e i g h t . . · pelts so supple they pass through a gold b r a c e l e t . . . in a new world of shimmering, velvety colors. T h i s magic transformation . . . from a woolly raw pelt to a luxurious permanent finish . . . is greatly helped by Mallinckrodt metallic salts and Gallotannins as mordants and tanning agents. Wherever up-to-date processes call for specific tannin content . . . low insolubles giving solutions of maximum clarity with minimal color, you'll find one of ten Mallinckrodt tannic acids specified· Beyond providing ideal mordanting for oxidation and basic dyes, fixatives for acid dyes, Mallinckrodt gallotannins are widely used as: polymerization inhibitors, sizing and fixative agents, coagulants, dénaturants, deflocculants, rust inhibitors . . . a list long enough to touch on an area of your interest as well. You should have our manual on Gallotannins. T h e specifications and brief product descriptions are based on our more than four decades of basic manufacturing experience . . . resulting in modern processing of purity-performance materials in bulk. Just send the coupon for return-mail reply.
(Mallinckrddt contributes TANNIC ACID T8 TECHNICAL GRADE • T a n n i n c o n t e n t : 85-87% • Insolubles: less t h a n 1% • Ratio of T a n n i n to total solids: 93-95% • Residue after ignition : typically less t h a n 0.1 % • Color of solution ( 4 5 0 0 A ) : less t h a n 1.1 optical density
TANNIC ACID
Send for Gallotannin Data Booklet describes various grades of tannic, gallic and pyrogallic acid derivatives available as bulk chemical intermediates. You will also find useful t h e Mallinckrodt Industrial P r o d u c t List that catalogs over 600 c o m p o u n d s available in bulk. M a i l t h e coupon o n t h e facing page today. Write: Mallinckrodt Chemical Works Industrial Chemicals Division Second and Mallinckrodt Streets St. Louis, Missouri 63160
Mallinckrodt
MALLINCKRODT CHEMICAL WORKS INDUSTRIAL CHEMICALS DIVISION St. Louis · N e w Y o r k · Los Angeles
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MALLINCKRODT CHEMICAL WORKS INDUSTRIAL CHEMICALS DIVISION Second & Mallinckrodt Streets. St. Louis. Mo. 6 3 1 6 0
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