Pre-dyes, mutable dye compositions, and methods of developing a color

A method of developing a color comprising:

• providing a {composition} pre-dye comprising a dye covalently bound to a radiation transorber adapted so that the pre-dye is colorless and will form a color when irradiated with radiation, the radiation transorber comprising a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor;
• and
• irradiating the {composition} pre-dye with radiation at a wavelength and dosage level sufficient to irreversibly mutate the {colorant} pre-dye, wherein the photoreactor is 1-›4-(2-hvdroxvethoxy)phenyl!-2-hydroxy-2-methyl-propan-1-one having the following formula ##STR28## or 1-hydroxycyclohexane phenyl ketone having the following formula ##STR29##

A mutable dye composition comprising a leuco dye admixed with a radiation transorber {comprising}, wherein the radiation transorber comprises a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor, wherein the photoreactor is 1-›4-(2-hydroxyethoxv)phenyl!-2-hydroxy-2-methyl-propan-1-one having the following formula ##STR30## or 1-hydroxycyclohexane phenyl ketone having the following formula ##STR31##

A method of developing a color comprising:

• providing a composition comprising a leuco dye admixed with a radiation transorber {comprising}, wherein the radiation transorber comprises a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor;
• and
• irradiating the composition with radiation at a wavelength and dosage level sufficient to irreversibly mutate the {colorant} leuco dye, wherein the photoreactor is 1-›4-(2-hydroxyethoxy) phenyl!-2-hydroxy-2-methyl-propan-1-one having the following formula ##STR32## or 1-hydroxycyclohexane phenyl ketone having the following formula ##STR33##

A pre-dye comprising a dye covalently bound to a radiation transorber adapted so that the pre-dye is colorless and will form a color when irradiated with radiation, the radiation transorber comprising a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor, wherein the wavelength-selective sensitizer is phthaloylglycine having the following formula ##STR34## or 4-(4-Hydroxy phenyl) butan-2-one having the following formula ##STR35##

A pre-dye comprising a dye covalently bound to a radiation transorber adapted sot that the pre-dye is colorless and will form a color when irradiated with radiation, the radiation transorber comprising a wavelength-selective sensitizer covalently bonded to reactive species-generating photoreactor, wherein the pre-dye has the formula ##STR40## or wherein X represents the radiation transorber, and wherein R represents a hydrogen, methyl, or ethyl group.

A method of developing a color comprising:

• providing a pre-dye comprising a dye covalently bound to a radiation transorber adapted so that the pre-dye is colorless and will form a color when irradiated with radiation, the radiation transorber comprising a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor;
• and
• irradiating the pre-dye with radiation at a wavelength and dosage level sufficient to irreversibly mutate the pre-dye, wherein the wavelength-selective sensitizer is phthaloylglycine having the following formula ##STR43## or 4-(4-Hydroxy phenyl) butan-2-one having the following formula ##STR44##

A method of developing a color comprising:

• providing a pre-dye comprising a dye covalently bound to a radiation transorber adapted so that the pre-dye is colorless and will form a color when irradiated with radiation, the radiation transorber comprising a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor;
• and
• irradiating the pre-dye with radiation at a wavelength and dosage level sufficient to irreversibly mutate the pre-dye, wherein the pre-dye has the formula ##STR49## wherein X represents the radiation transorber, and wherein R represents a hydrogen, methyl, or ethyl group.

A mutable dye composition comprising a leuco dye admixed with a radiation transorber comprises a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor, wherein the wavelength-selective sensitizeris phtaloylglycine having the following formula ##STR52## or 4-(4-Hydroxy phenyl) butan-2-one having the following formula ##STR53##

A method of developing a color comprising:

• providing a composition comprising a leuco dye admixed with a radiation transorber, wherein the radiation transorber comprises a wavelength-selective sensitizer covalently bonded to a reactive species-generating photoreactor;
• and
• irradiating the composition with radiation at a wavelength and dosage level sufficient to irreversibly mutate the leuco dye, wherein the wavelength-selective sensitizer is phthaloylglycine having the following formula ##STR58## or 4-(4-Hydroxy phenyl) butan-2-one having the following formula ##STR59##