Silklscreening.. on metal

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have any of you had experience with silkscreening.. or specifically silkscreening on metal (anodized aluminum)? Is there any kind of ink/process that works better than others?

any and all input welcome! I know it's kind of a longshot, but figured I'd ask :)

I know there are tutes in memories about silkscreening.. but nothing specific to aluminum.