Abstract
Studies of the distribution of tannic acids absorbed by wool show that in undamaged fibers most of the acids are con- , centrated in a thin layer near the surface. The evenness of absorption is improved by prechlorination of the wool. The potentially serious effects of traces of iron in the wool, which yield highly-colored ferric tannates, may be minimized by carrying out the treatment of wool with tannic acids in acidified solutions. However, the fixation of tannic acids by aluminum is less effective under acidic conditions, so a compromise is necessary if the resist treatment is to be applied from a single bath.
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