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These are optional supplies, often "consumables"
Shiny surfaces such as backs of iPods: use the Cermark laser etching spray - we get ours from Laserbits ($64). Spray the back of the iPod, wait 15-20 minutes then etch as usual. The power should be 100% and the speed should be the wattage of your laser, for us the speed is 35 since we have a 35W later.