Metal salt activators for use in leuco dye compositions

An optical disk, comprising an optical disk substrate having a color forming composition coated thereon, said color forming composition comprising:

• a) a color forming leuco dye;
• b) a metal salt activator configured for reaction with the color forming leuco dye to form a colored dye;
• c) an amine suppression agent configured for inhibition of reaction of the metal salt activator with the color forming leuco dye;
• and
• d) an initiator precursor configured for forming an initiator upon application of energy.

A method of forming color images on a substrate, comprising:

• a) applying a color forming composition onto a substrate, said color forming composition being a mixture including:
• i) a color forming leuco dye;
• ii) a metal salt activator configured for reaction with the color forming leuco dye to form a colored dye;
• iii) a suppression agent configured for inhibition of reaction of the metal salt activator with the color forming leuco dye;
• and
• iv) an initiator precursor configured for forming an initiator upon application of energy;
• and
• b) applying energy to the color forming composition sufficient to cause reaction of the metal salt activator with the leuco dye without decomposing the color forming composition.