We have a number of cancelled chips in Chris and my collection of $1 Nevadas. I beleive that it would create a serious conflict in my collecting attitude if I tried to make ANY of my chips look differently then when I traded for them or bought them. I know some folk don't have a problem cleaning a chip but there is slippery slope out there and any attempt to change what you GOT to to what you WANT doesn't sit well with me! Fill a drill hole anyone?