I have seen recently on Aliexpress a new kind of key rings, made of so-called ‘crystal K9’:
They come with a led and a small battery, and they shine various colours. The logo seems to be laser engraved. I wonder if anyone knows what this ‘crystal K9’ is and if I can engrave it using my CO2 laser ?
Furthermore, it seems that they engrave the picture inside the crystal. Is it possible to do that, for example just by focusing the light in the middle of the crystal thickness? Or is it just 2 half crystals (one engraved) glued to each other? I doubt it though, because there would be some glue traces visible when it is lit…
Has anyone ever tried this ?