3. Aged 20 hours-partial hydrolysis 3. No aging. Solution is ripened. No occurs. hydrolysis. 4. Precipitated as acid resin flakes. 4. Same as acetate. 5. Flakes dissolved in acetone. 5. Flakes dissolved in methylene chloride.

In single yarn the irregularities may be due to the inclusion of knots, loops, curls, slubs and the like. In plied yarns the irregularities may be due to a variable delivery of one or more of its components or to twisting together dissimilar single yarns.