|50 count 1981 Topps Nolan Ryan #240, direct from Vending boxes, no wax/gum stain|
Gum stain: Similar to a wax stain. Back in the day when cards came with a slab of "stale gum," it created condition problems for the cards against which it rubbed. The gum would melt due to heat or humidity, and foul the surface of the card. It is possible to nearly completely remove a gum stain, but some residue is almost always left.