Nylon filament yarn colored with acid dyes frequently shows unevenness in appearance. In some cases this unevenness can be traced to slight differences in orientation due to uneven drawing. In other cases small changes in the number of amine end-groups in the polymer cause this effect. It has been found that this unevenness can be minimized, and with some colors completely eliminated, by dyeing in a bath so dilute in dye as to be colorless to the eye.
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