I have some beer glasses with decal-like decorations that I assume are some kind of plastic or maybe even glass/faience. How are these made?
My guess is that it is Pyrography.– SurbJan 19, 2017 at 13:03
@Surb woodburning? how does that work in the context of glassware decals?– EricaJan 19, 2017 at 15:47
@Erica well Pyrography is usually done on wood but can also be applied on glass (note that there is nothing about "wood" in the word pyrography). Some examples (it might be my translation of "pyrogravure" which is wrong though...)– SurbJan 19, 2017 at 16:00
@Erica However, I guess your answer is correct (especially because of the different colors).– SurbJan 19, 2017 at 16:05
1Ah -- I think that is more accurately engraving (or perhaps etching, but I think that's chemical-based rather than mechanical) rather than burning.– EricaJan 19, 2017 at 16:12
This is most likely an applied ceramic label. It's an industrial process that can't be achieved in a typical handmade craft setting (e.g., your garage), requiring ceramic inks or enamels, screen printing to apply the design, and high-temperature baking to set.
If you're considering removing an ACL to decorate the beer glass differently, the verdict is apparently that it isn't really removable (see related Q/A).