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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

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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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; anda substrate having a treated portion on which a color former leuco dye ha

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; anda 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. 2. The system of claim 1, wherein the color-changing marking medium is a crayon. 3. The system of claim 2, wherein the activator is present in an amount of about 1% to about 30% by weight of the crayon and the solvent is present in an amount of about 10% to about 30% by weight of the crayon. 4. The system of claim 3, wherein the activator is present in an amount of about 10% to about 15% by weight of the crayon, and the solvent is present in an amount of about 15% to about 20% by weight of the crayon. 5. The system of claim 4, wherein the activator is present in an amount of about 10% by weight of the crayon, and the solvent is present in an amount of about 19% by weight of the crayon. 6. The system of claim 5, wherein the activator is 4-(4-isopropoxyphenylsulfonyl)phenol and the solvent is propylene carbonate. 7. The system of claim 4, wherein the activator is present in an amount of about 13% by weight of the crayon, and the solvent is present in an amount of about 16% by weight of the crayon. 8. The system of claim 7, wherein the activator is Fulacolor XW and the solvent is dimethyl adipate. 9. The system of claim 1, wherein the marking medium is a colored pencil. 10. The system of claim 9, wherein the marking medium includes solvent for solvating the activator in the colored pencil. 11. The system of claim 1, wherein the marking medium is a colored paint. 12. The system of claim 11, wherein the paint includes solvent and gellant. 13. The system of claim 12, wherein the activator is 4-(4-isopropoxyphenylsulfonyl)phenol, the solvent is dimethyl adipate, and the gellant is Sylvaclear PE 1800 resin. 14. The system of claim 12, wherein the activator is present in an amount of about 20% to about 30% by weight of the total quantity of paint, the solvent is present in an amount of about 20% to about 30% by weight of the total quantity of paint, the gellant is present in an amount of about 5% to about 10% by weight of the total quantity of paint, and colored crayon is present in an amount of about 30% to about 55% by weight of the total quantity of paint. 15. The system of claim 14, wherein the activator is present in an amount of about 27% by weight of the total quantity of paint, the solvent is present in an amount of about 27% by weight of the total quantity of paint, the gellant is present in an amount of about 6% by weight of the total quantity of paint, and colored crayon is present in an amount of about 40% by weight of the total quantity of paint. 16. The system of claim 1, wherein the color-changing marking medium is a color-changing marker ink that comprises at least one nonaqueous solvent and a solvent dye. 17. The system of claim 16, wherein the marker ink further comprises a first nonaqueous solvent and a second nonaqueous solvent. 18. The system of claim 17, wherein the activator is 4-(4-isopropoxyphenylsulfonyl)phenol. 19. The system of claim 17, wherein the first nonaqueous solvent is ethanol and the second nonaqueous solvent is isopropanol. 20. The system of claim 16, wherein the solvent dye is present in an amount of about 0.1% to about 1.0% by weight of the marker ink, the activator is present in an amount of about 10% to about 15% by weight of the marker ink, and the at least one nonaqueous solvent is present in an amount of about 84% to about 89.9% by weight of the marker ink. 21. The system of claim 20, wherein the solvent dye is present in an amount of about 0.5% by weight of the marker ink, the activator is present in an amount of about 12% by weight of the marker ink, and the at least one nonaqueous solvent is present in an amount of about 87.5% by weight of the marker ink. 22. The system of claim 21, wherein the at least one nonaqueous solvent includes a first nonaqueous solvent and a second nonaqueous solvent, and wherein the first nonaqueous solvent is present in an amount of about 67% by weight of the marker ink and the second nonaqueous solvent is present in an amount of about 20.5% of the marker ink. 23. The system of claim 22, wherein the first nonaqueous solvent is ethanol and the second nonaqueous solvent is isopropanol. 24. The system of claim 1, wherein the marking medium is a color-changing nail polish and the substrate is an overlay that attaches to a nail. 25. The system of claim 24, wherein the activator is 4-(4-isopropoxyphenylsulfonyl)phenol. 26. The system of claim 24, wherein the color-changing nail polish includes a colored, solvent-based, non-reactive nail polish present in an amount of about 90% to about 95% by weight of the color-changing nail polish, and the activator is present in an amount of about 5% to about 10% by weight of the color-changing nail polish. 27. The system of claim 26, wherein the activator is present in an amount of about 8% by weight of the color-changing nail polish, and the solvent-based, non-reactive nail polish is present in an amount of about 92% by weight of the color-changing nail polish. 28. The system of claim 24, wherein the color-changing nail polish further includes ethyl cellulose, anhydrous isopropanol, and ethanol SDA 40B. 29. The system of claim 28, wherein the ethyl cellulose is present in an amount of about 3.0% to about 5.0% by weight of the color-changing nail polish, the anhydrous isopropanol is present in an amount of about 15% to about 25% by weight of the color-changing nail polish, the ethanol SDA 40B is present in an amount of about 60% to about 65% by weight of the color-changing nail polish, and the 4-(4-isopropoxyphenylsulfonyl)phenol is present in an amount of about 5% to about 20% by weight of the color-changing nail polish. 30. The system of claim 29, wherein the ethyl cellulose is present in an amount of about 3.6% by weight of the color-changing nail polish, the anhydrous isopropanol is present in an amount of about 20% by weight of the color-changing nail polish, the ethanol SDA 40B is present in an amount of about 62.6% by weight of the color-changing nail polish, and the 4-(4-isopropoxyphenylsulfonyl)phenol is present in an amount of about 11.8% by weight of the color-changing nail polish. 31. The system of claim 1, wherein the leuco dye is selected from the group consisting of Copikem 14, Copikem Magenta 20, Copikem 6, Copikem 4, Pergascript Orange I-5R, Pergascript Red I-6B, Pergascript Green I-3G, Pergascript Yellow I-3R, Pergascript I-2RC Reakt Red 448, Reakt Yellow 186, EAB-F, Specialty Magenta 20, Specialty Red 747, Specialty Black 34, Specialty Magenta 16, Specialty Orange 14, Specialty Blue 1, Specialty Cyan 39, and Specialty Yellow 37, and Orange DCF. 32. The system of claim 1, wherein the activator is selected from the group consisting of D8 (4-hydroxy 4-isopropoxy diphenyl sulfone), bisphenol, phenolic resin, alkylphenol novolac resin, zinc chloride, a hydroxybenzoate, 4-(4-isoproproxyphenylsulfonyl)phenol, “4,4′-Sulfonyldiphenol”, zinc salicylate, zincated phenolic resin, reactive acidic clay, o-Benzoic Sulfimide, and o-Hydroxybenzoic acid. 33. The system of claim 1, wherein the at least one nonaqueous solvent is selected from the group consisting of Propylene Carbonate, 2,2,4-Trimethyl 1,3 Pentanediol monisobutyrate, Disiopropyl Adipate, Dimethyl Adipate, C12-15 Alkyl Benzoate, Tri-n-butylcitrate, Octyl Palmitate, Dioctyl Sebacate, Dibutyl Sebacate, Methyl Laurate/Myristate, Triethyl Citrate, Acetyl Triethyl Citrate, Acetyl Tributyl Citrate, Isopropyl Palmitate, and Stearyl Alcohol. 34. A color-changing marking system, comprising: a color-changing marking medium having a nominal color and including a color former leuco dye that is not soluble in an aqueous solvent and at least one nonaqueous solvent; anda substrate having a treated portion on which a color developer activator 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. 35. The system of claim 34, wherein the color-changing marking medium is a crayon. 36. The system of claim 35, wherein the leuco dye is present in an amount of about 0.1% to about 5% by weight of the crayon, the solvent is present in an amount of about 10% to about 30% by weight of the crayon, and colored crayon ingredients are present in an amount of about 65% to about 88.9% by weight of the crayon. 37. The system of claim 36, wherein the leuco dye is present in an amount of about 0.2% by weight of the crayon and the solvent is present in an amount of about 25% to about 30% by weight of the crayon. 38. The system of claim 36, wherein the solvent includes a first solvent and a second solvent. 39. The system of claim 38, wherein the first solvent is present in an amount of about 12.5% to about 15% by weight of the crayon and the second solvent is present in an amount of about 12.5% to about 15% by weight of the crayon. 40. The system of claim 39, wherein the first solvent is present in an amount of about 14.3% by weight of the crayon and the second solvent is present in an amount of about 14.3% by weight of the crayon. 41. The system of claim 38, wherein the first solvent is Tri-n-butylcitrate and the second solvent is Dimethyl Adipate. 42. The system of claim 34, wherein the leuco dye is selected from the group consisting of Copikem 14, Copikem Magenta 20, Copikem 6, Copikem 4, Pergascript Orange I-5R, Pergascript Red I-6B, Pergascript Green I-3G, Pergascript Yellow I-3R, Pergascript I-2RC Reakt Red 448, Reakt Yellow 186, EAB-F, Specialty Magenta 20, Specialty Red 747, Specialty Black 34, Specialty Magenta 16, Specialty Orange 14, Specialty Blue 1, Specialty Cyan 39, and Specialty Yellow 37, and Orange DCF. 43. The system of claim 34, wherein the activator is selected from the group consisting of D8 (4-hydroxy 4-isopropoxy diphenyl sulfone), bisphenol, phenolic resin, alkylphenol novolac resin, zinc chloride, a hydroxybenzoate, 4-(4-isoproproxyphenylsulfonyl)phenol, “4,4′-Sulfonyldiphenol”, zinc salicylate, zincated phenolic resin, reactive acidic clay, o-Benzoic Sulfimide, and o-Hydroxybenzoic acid. 44. The system of claim 34, wherein the at least one nonaqueous solvent is selected from the group consisting of Propylene Carbonate, 2,2,4-Trimethyl 1,3 Pentanediol monisobutyrate, Disiopropyl Adipate, Dimethyl Adipate, C12-15 Alkyl Benzoate, Tri-n-butylcitrate, Octyl Palmitate, Dioctyl Sebacate, Dibutyl Sebacate, Methyl Laurate/Myristate, Triethyl Citrate, Acetyl Triethyl Citrate, Acetyl Tributyl Citrate, Isopropyl Palmitate, and Stearyl Alcohol. 45. The system of claim 34, wherein the marking medium is a colored pencil. 46. The system of claim 45, wherein the marking medium includes solvent for solvating the leuco dye in the colored pencil. 47. The system of claim 34, wherein the marking medium is a colored paint. 48. The system of claim 47, wherein the paint includes solvent and gellant. 49. The system of claim 34, wherein the color-changing marking medium is a color-changing marker ink that comprises at least one nonaqueous solvent and a solvent dye. 50. The system of claim 34, wherein the marking medium is a color-changing nail polish and the substrate is an overlay that attaches to a nail. 51. A color-changing marking system, comprising: a color-changing marking medium having a nominal color, and including a fully or partially solvated color developer activator and an abrasive; anda substrate having a treated portion on which a color former leuco dye and a second color developer activator have 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 creates marks of a changed color on the treated portion of the substrate in response to both heat generated and a chemical reaction between the color former leuco dye, the second activator, and the fully or partially solvated activator. 52. The system of claim 51, wherein the marking medium is a crayon or colored pencil. 53. The system of claim 52, wherein the abrasive is selected from the group consisting of silica, titanium dioxide, calcium carbonate, clay or talc.