Once and a while you get "very good" consistant results with Cermark.
Maybe this can bring in a few bucks for some.
2nd Gen Ipod Touch. Chrome Back
Cermark LMM6000 Spray
Clean the back with Denatured alcohol and do not touch after it is clean. (important) Spray with Cermark. Make sure the spray and your item are over 70 degrees. Use the lightest coat you can but get full coverage. More is not better in this case. Lasers fine when colder but results are far superior when the temp at application was warm.
Settings. Most of the settings I saw with Cermark were full power with the speed being adjusted to the power of your laser. I could never get that to work with any consistancy. With a 75 watt laser I use 30Power 40Speed and 1200 dpi. A 45 watt and 35 watt would be 30Power and 20Speed and 1200 dpi. Usually it doesn't serve any purpose to print a 300 dpi graphic at 1200 dpi but with Cermark it made a huge difference in the quality of the mark. Hope some of this can help. There are a ton of new iPod's out there. No, I don't know if would void the warranty. Next experimental volunteers will be with greyscale photo's.