Chalking.

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1. The decomposition of a paint film into a loose powder on the surface; mild chalking, accompanied by satisfactory color retention in tinted paint, is considered a desirable characteristic; heavy chalking which washes off to leave an unprotected surface is highly undesirable; before recoating a heavily chalked surface, all of the chalk should be removed by vigorous brushing. 2. The dusty powdering on an asphalt roof surface that is subject to ultraviolet degradation.

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