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SUPPLEMENTING previous work on permanence of alpha cellulose of pulps and half-stuffs, subjected to accelerated aging tests, samples of a new, white, rag half-stuff were treated with I and 3 per cent. bleach powder. These bleached samples thoroughly washed were made into hand-sheets and subjected to the usual 72-hour heat treatment at IOO ยฐ C. Control and heated samples were analyzed for alpha cellulose content. The results which are tabulated below, check conclusively those previously obtained with the various grades of rag half-stuffs, and show clearly the effect of the presence of oxycellulose on the permanence of the cellulose fibers. Color permanence was also shown to be drastically lowered by the increased formation of oxycellulose.
Amount of Bleach, Per Cent.
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lO8 U.S. BUREAU OF STANDARDS NOTES. [J. F. I.
Feb., I933.] CURRENT TOPICS. 23I worded as to give the reader the impression that every product was produced under the closest supervision of a food chemist. The only admirable part of the advertisement was the courage and daring of the manufacturer in having it published. The "chemist" was none ot