lliard balls Answered

If the discoloration is within the resin (internal) it would be next to impossible to fix this.

i wouldnt do anything that adds/subtracts from the surface. mighnt screw it up lol i dont know what to tell you

Maybe polish them with a bowling ball polisher?

I know nothing about billiard balls other then how to get em in the pocket. But in considering it I would assume they are painted and shelaqued or clear coated or something. Couldn't you take a fine sandpaper and sand them well.....then re-clear coat them? I would guess making sure they are done with no lumps or bubbles... so you'd want to dip them somehow rather then paint it on.