A negotiable document having enhanced security for deterring fraud includes at least one thermochromatic fingerprint image printed with thermochromatic ink, wherein said thermochromatic fingerprint image will fade when heat is transferred to the image from a live human hand. The negotiable document further...http://www.google.ca/patents/US6030000?utm_source=gb-gplus-sharePatent US6030000 - Negotiable document having enhanced security for deterring fraud by use of a thermochromatic fingerprint image
