Lithographic printing plate precursor and method of use

A lithographie printing plate precursor comprising:

• a substrate, and
• an infrared radiation-sensitive image-recording layer disposed on the substrate, the infrared radiation-sensitive image-recording layer comprising the following components (1), (2), and (3):
• (1) a free radical initiator composition that is capable of generating free radicals upon exposure to infrared radiation, and which comprises an electron-donating agent;
• (2) a free radically polymerizable composition;
• and
• (3) a color-changing compound that is represented by the following Structure (I)
• wherein:
• Ar1 and Ar2 independently represent the atoms necessary to complete substituted or unsubstituted aromatic rings or to complete substituted or unsubstituted heteroaromatic rings;
• R is hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl groups;
• R1 and R2 are independently unsubstituted alkyl groups or a chain of carbon atoms interrupted by one or more ether or ester linkages;
• R3 is a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group;
• Y represents an oxygen atom, a sulfur atom, or a dialkylmethylene group represented by >C(R4R5) wherein R4 and R5 are independently substituted or unsubstituted alkyl groups having 1 to 4 carbons;
• A1 and A2 independently represent substituted or unsubstituted alkyl groups, or together they represent the two or three carbon atoms necessary to form a substituted or unsubstituted 5- or 6-membered non-aromatic carbocyclic ring;
• and
• Za represents one or more counter ions to balance the electric charge in the rest of the color-changing compound according to Structure (I).