Method of producing color change in overlapping layers
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United States of America Patent
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May 7, 2013
Grant Date -
May 5, 2011
app pub date -
Nov 4, 2009
filing date -
Nov 4, 2009
priority date (Note) -
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Abstract
The present invention relates to methods of producing color change in overlapping layers of material. The method comprises providing a first layer having a first activatable colorant and a second layer having a second activatable colorant. A first external stimulus is applied to activate the first activatable colorant and produce a first activated color region in the first layer. A second external stimulus is applied to activate second activatable colorant and produce a second activated color region in the second layer.
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