Abstract: A time color indicator and method are provided. The time color indicator includes a base layer segment having a transparent impermeable layer, a substantially non-curing opaque coating, and a release sheet. A portion of the uncoated surface of the transparent layer bears a printed area including a camouflage pattern printed with non-migrating ink and a message segment printed with migrating ink. An indicator layer segment includes a transparent impermeable layer, a substantially non-curing opaque coating, and a release sheet partially folded back to form a finger gripping tab and expose an indicator layer coating portion which contacts and adheres to the base layer adjacent the printed area. The time color indicator is activated by pulling the finger tab to remove the release sheet, causing the indicator layer coating to cover and contact the printed area, with the message segment migrating through the indicator layer coating.

Abstract: A time-delayed message indicator system typically displays a printed message pattern on a contrasting viewing surface at a predetermined time after activation. One preferred indicator system employs a migrating message pattern and has a laminar, multilayer construction. The message is printed on a source layer using a migratable ink. An opaque layer overlies the source layer and a release layer protects the migratable message from contact with the opaque layer until the system is activated by removal of the release layer initiating migration of the message ink through the opaque layer. Arrival of the message agent at the viewing surface initiates development of a visible message pattern. To enhance the development process the invention includes a message development trigger, for example, a heating system. The heating system can consist of exothermic chemical reactants that are mixed to react and produce heat, for example by oxidizing iron filings or activated carbon.

Abstract: A time color indicator and method are provided. The time color indicator includes a base layer segment having a transparent impermeable layer, a substantially non-curing opaque coating, and a release sheet. A portion of the uncoated surface of the transparent layer bears a printed area including a camouflage pattern printed with non-migrating ink and a message segment printed with migrating ink. An indicator layer segment includes a transparent impermeable layer, a substantially non-curing opaque coating, and a release sheet partially folded back to form a finger gripping tab and expose an indicator layer coating portion which contacts and adheres to the base layer adjacent the printed area. The time color indicator is activated by pulling the finger tab to remove the release sheet, causing the indicator layer coating to cover and contact the printed area, with the message segment migrating through the indicator layer coating.