Color-changing marking implement and substrate
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United States of America Patent
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Sep 2, 2014
Grant Date -
Jul 11, 2013
app pub date -
Jan 6, 2012
filing date -
Jan 6, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A color-changing marking system, including a color-changing marking medium and a substrate. The color-changing marking medium has a nominal color and includes a color developer activator and/or color former leuco dye. The substrate includes a treated portion on which a color former leuco dye and/or color developer activator has been applied. Application of the color-changing marking medium to an untreated portion of the substrate causes the color-changing marking medium to create marks of the nominal color. Application of the color-changing marking medium to the treated portion of the substrate causes the color-changing marking medium to create marks of a changed color in response to a chemical or mechanical reaction between the leuco dye and the activator. The marking medium may a crayon, colored pencil, marker ink or paint.
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Cited Art Landscape
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