A surface defect consisting of alternating ridges and valleys at right angles to the direction of extrusion.

The sawtooth pattern along a cut line on artwork patterns caused by an uneven blade application while scribing the line cut.

A visible "wavy" condition across the surface width of a panel created when the panel is sanded. Chatter marks are parallel to one another, usually between 1/4" and 1/2" apart, and perpendicular to the sanding direction.

Lines appearing across the panel at right angles to the grain giving the appearance of one or more corrugations resulting from bad setting of sanding equipment.

Uneven imperfections in an aluminum extrusion characterized by ridge and depressions, which produce a wavy appearance.