Farmingdale, N.Y.-based Seal-It Inc. is introducing thermochromatic inks, an exciting new way to print shrink labels that will increase sales with the magic of color change. Color changes occur on the shrink label because the ink is temperature sensitive. The ink has to be subjected to either hot or cold temperature to see the effect. The marketing potential for this ink technology is enormous. Imagine a manufacturer wanting to promote its product with a game that includes a secret code printed on the label.