Who specialises in sales promotion "reveal" substrates?

Question

Specifically, i want to find a manufacturer/supplier of either heat or friction revealing materials - the kind you sometimes get with on pack promotions where you rub a thumb of it to reveal a hidden message. I'd also like to know whether a "pressure" reveal material exists - for instance something which i could mark with my fingernail but would fade away after a few seconds. Can anyone help??

Answer 1

This country no longer does manufacturing - try China.