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US 8,460,597 B2Granted
Method of producing color change in a substrate
AssigneeThe Procter & Gamble Company
InventorsTimothy Ian Mullane, Kelyn Anne Arora
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Abstract
The present invention relates to a method of producing color change in a substrate. The substrate includes an activatable colorant and a region that is heated prior to activating the activatable colorant. The substrate is exposed to electromagnetic radiation producing a first activated color region in the heated region and a second activated color region in a non heated region. The first activated color region appears in a different shade than the second activated color region.
Claims18
A method of producing color change in a substrate, the method comprising the steps of:
- a. providing a substrate comprising an activatable colorant;
- b. heating a region of the substrate forming a heated region;
- and
- c. applying electromagnetic radiation to the substrate to activate the activatable colorant producing a first activated color region in the heated region and a second activated color region separate from the heated region;
- wherein the step of heating a region of the substrate comprises mechanically deforming the region of the substrate wherein heat is induced by strain;
- and
- wherein the electromagnetic radiation comprises ultraviolet light.
4 more elements
Dependencies are inferred from the claim text.