Imaging particulates, paper and process, and imaging of paper using dual wavelength light

A process for making a dual wavelength imaging composition comprising the following steps:

• (a) providing a solvent;
• and
• (b) dispersing a plurality of dual wavelength image-forming particulates in the solvent to form a dual wavelength imaging composition, wherein each particulate of the plurality of particulates comprises a polymeric matrix of polymer material in which is contained:
• one or more image-forming agents comprising a light activated dye;
• a photo-oxidizing agent which is activated at a first wavelength of light to cause the one or more image-forming agents to form one or more images;
• and
• a reducing agent which is activated at a second wavelength of light to cause termination of the formation of the one or more images.

A process for making a dual wavelength imaging composition comprising the following steps:

• (a) providing a solvent;
• and
• (b) dispersing a plurality of dual wavelength image-forming particulates in the solvent to form a dual wavelength imaging composition, wherein each particulate of the plurality of particulates comprises a matrix of polymer material and contains:
• one or more image-forming agents;
• a photo-oxidizing agent which is activated at a first wavelength of light to cause the one or more image-forming agents to form one or more images;
• and
• a reducing agent which is activated at a second wavelength of light to cause termination of the formation of the one or more images;
• wherein the particulates of step (b) are formed by the steps of:
• (c) coarsely grinding solid polymer material to form coarsely ground particulates;
• (d) dispersing the coarsely ground particulates in starch in water mixture to form a slurry;
• and (e) wet slurry grinding the dispersed particulates to provide the particulates of step (b).