Black sharpies... when I was 1st shown that by my friend Kyle, owner of Circle M Saddle Shop in Prescott, KS I laughed for days. Now I have a large supply of them for use myself! Thanks Bruce! Thanks Kyle! Also have been experimenting with paint markers I found in the craft section at WalMart. They're about $2 apiece, come in all basic colors, & last a long time. I've been using them on some of my edges, which I afterwards wax & hand rub.