About Chemical Innovation - Subscription Information
February 2001
Vol. 31, No. 2, pp. 47–48.
Learning from the Past

Table of Contents

David Haas
Figure 6 Figure 6. A VCP promotion product is printed as a uniform dot pattern with two inks. One ink migrates during image development. The second ink, in a matching color, is permanent and nonmigrating, which camouflages the image. The transparent adhesive FrontPart causes only the migrating ink dots to appear, creating the image.
Figure 7 Figure 7. A VCP promotion product printed with an irregularly shaped dot pattern (a mezzotint) with two inks: a migrating ink and a permanent ink in a matching color that camouflages the image.
Figure 8 Figure 8. A self-expiring school visitors’ pass with an activating “smiley face” timing cover. Thousands of school districts nationwide are using these simple, low-cost passes as a part of the security enhancement procedures that have been implemented over the past few years.
Return to Times-up! The color-changing self-expiring badge