Accelerated development time-delayed message system

A time-delayed message display system for displaying a message pattern of a colorant on a viewable surface against a contrasting background for viewing by reflected light, at a predetermined time after activation, said message display system having an essentially laminar, multilayer construction and comprising:

• a) a source layer supporting a printed image of said colorant in a desired message pattern;
• b) an opaque polymer film layer to overlie said source layer, said colorant being migratable through said opaque polymer film layer;
• and
• c) a release layer protecting said colorant from contact with said opaque polymer film layer, said release layer being removable to activate the system by initiating migration of said colorant through or to said opaque polymer film layer;
• wherein said message display system further comprises:
• d) a chemical reactant heating system to trigger rapid development of the message at said visible surface by heating said opaque polymer film layer to accelerate migration of said colorant through said opaque polymer film;
• and
• e) a removable barrier preventing said chemical reactant heating system from reacting.

A time-delayed message display system for displaying a message pattern of a pH-indicating dye against a contrasting background at a predetermined time after activation, said message display system having an essentially laminar, multilayer construction and comprising:

• a) a source layer supporting a migratable acid or base;
• b) a timing layer to overlie said source layer, said acid or base being migratable through said timing layer;
• c) a release layer protecting said acid or base from contact with said timing layer, said release layer being removable to activate the system by initiating migration of said acid or base through said timing layer;
• and
• d) a basic or acid buffer, respectively, to delay pH changes at said visible surface, whereby migration of sufficient acid or base to said visible surface provides a rapid color change in said pH-indicating dye.

A time-delayed message display system for displaying a message pattern of a colorant on a viewable surface against a contrasting background for viewing by reflected light, at a predetermined time after activation, said message display system having an essentially laminar, multilayer construction and comprising:

• a) a source layer supporting a migratable message agent;
• b) an opaque polymer film layer to overlie said source layer, said message agent being migratable through said opaque polymer film layer;
• and
• c) a release layer protecting said message agent from contact with said opaque polymer film layer, said release layer being removable to activate the system by initiating migration of said message agent through or to said opaque polymer film layer;
• wherein arrival of said message agent at said viewable surface initiates development of a visible message pattern, said message display system further comprising:
• and
• d) a message development trigger acting to accelerate migration of said message agent through said opaque polymer film to promote said development of a visible message pattern;
• whereby development of said visible message is accelerated.