What ink?
What ink?
Out of context: Reply #2
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- Nairn0
I think, in this instance, that the piece is done in 2-ply (judging by the holes at the top), with hunter printed on reverse, which would prevent see-through when the light is off.
You could use 'thermochromic' inks, which change with heat, and the only place I've come across them practically are from in sticker format from a company called Mercian Labels (UK).
I can imagine ink altered by light would be a permenant change, rather than the temporary one you are after..