Inkless printing method
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United States of America Patent
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Oct 25, 2016
Grant Date -
Jun 12, 2014
app pub date -
Jul 23, 2012
filing date -
Jul 22, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to a method of marking a substrate that comprises a color forming material, comprising the steps of: activating a region of the substrate so as to transform it from an inactive, low reactive state to an active, high reactive state; irradiating a part of the activated region with an initial color changing radiation to effect an initial color change to a first color; and irradiating a part of the substrate that has been changed to the first color with a high power density beam of visible electromagnetic radiation to effect a further color change of the irradiated region to a second color.
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