I'm not entirely sure how you'd go about it....I imagine there's some sort of specific machinery out there in the wide world to do it via silk screening, but the more usual method would be using decals.
I've directly screenpriinted flat glass with etching fluid, which eats away a thin layer to superb results, but for curved small shot glasses, I think decals would be the way to go.
FYI...there was a thread recently on the Heat_transfers_for_desktop_printers Y group I belong to. Sorry, CRS (cannot remember stuff) on details. I think the conclusion was a wholesale vendor was the way to go. You might try screenprinters.net and do a search or post there. Cheers, Susan H.
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