Usually, Wet rubbing fastness ratings are lower than those of dry rubbing. However, there may be cases when it is reversed. As per Texanlab manual:
"This is sometimes observed in polyester fabrics. In these cases, the friction coefficient in wet crocking is lower than dry crocking. Thus, in contrast to cotton, the colorfastness to wet crocking for polyester is higher than its colorfastness to dry crocking."
Other Resources:
1
How a Rubbing Fastness Tester Works. Watch this video:
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"This is sometimes observed in polyester fabrics. In these cases, the friction coefficient in wet crocking is lower than dry crocking. Thus, in contrast to cotton, the colorfastness to wet crocking for polyester is higher than its colorfastness to dry crocking."
Other Resources:
1
How a Rubbing Fastness Tester Works. Watch this video:
Buy my books at Amazon.com
