Centering55/45 or better on the front. 70/30 or better on the back.
CornersModerate wear on corners, with fraying & chipping. Noticeable by the naked eye and more pronounced under magnification.
EdgesSevere damage, including heavy chipping, fraying, or tears along all edges. Significant paper loss and potential for large sections of the edge missing.
SurfaceExtensive damage including deep creases, heavy scratches/micro-scratches, stains, and surface residue.