Color-changing marking implement and substrate

摘要

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.

主权项

1. A color-changing marking system, comprising:
a color-changing marking medium having a nominal color and including a color developer activator that is not soluble in an aqueous solvent and at least one nonaqueous solvent; and a substrate having a treated portion on which a color former leuco dye has been applied; wherein 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, and 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 reaction between the leuco dye and the activator.