“Heat Reactive Verification Signature or Logo”
U.S. Patent 5,636,874
Signatures, logos or other graphics are printed in low density patterns using thermochromic inks which will obscure or disappear when scanned or photocopied.
Center Logo Phantom and/or signature obscures when digitally scanned or photocopied.
![nodupit](https://devsite14.com/wp-content/uploads/2020/04/nodupit.jpg)