I actually tried anodizing at my shop to harden #40 chain aluminum gears for my microsprint, read an article on the web and got myself a 12v battery charger, tupperware container and some battery acid ( you mix it with water ) and some RIT DYE to add some color, i was suprized how easy it was to do, some colors were hit and miss and actually came up with some cool colors i wasn't expecting.