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sizing

Starch, gelatin, glue, wax, casein, or clay added to fabrics in the finishing stages to give fabric additional body, a smoother appearance, and more weight. Cotton fabrics are those most commonly treated in this manner. At one time, sizing had to be replaced after each cleaning. Today, with more advanced finishing techniques, sizing is rarely used and fabrics usually retain their initial appearance through cleaning. A few fabrics such as needlepoint canvas are still sized so that they can be handled more easily. This in no way affects their final performance. Sizing also refers to the starch that is applied to the warp yarns to help prevent abrasion during the weaving process. This sizing is usually removed from the fabric in one of the finishing steps.