Marking substrates

A method of marking a substrate, comprising:

• contacting the substrate with a composition having a material with a substructure
• 8
• contacting the composition with energy sufficient to produce a change in the composition that can be detected optically,
• wherein each of R1 through R6 is independently selected from the group consisting of hydrogen, hydroxyl, a substituted or unsubstituted (C1-C10) alkyl, a substituted or unsubstituted (C1-C10) hydroxyalkyl, a substituted or unsubstituted (C1-C10) alkyloxy, a substituted or unsubstituted (C1-C10) alkyloxy-(C1-C10) alkyl, a substituted or unsubstituted (C1-C10) alkylamino-(C1-C10) alkyl, a substituted or unsubstituted (C1-C10) aminoalkyl, a substituted or unsubstituted aryl, a substituted or unsubstituted (C1-C10) hydroxyaryl, a substituted or unsubstituted (C1-C10) aryloxy, a substituted or unsubstituted (C1-C10) aminoaryl, a substituted or unsubstituted arylalkyl, a substituted or unsubstituted C1-C10 haloalkyl, a substituted or unsubstituted C2-C6 alkenyl, a substituted or unsubstituted C2-C6 alkynyl, oxo, a substituted or unsubstituted (C1-C10) aminoalkyloxy, a substituted or unsubstituted (C1-C10) aminoalkylcarboxy, a substituted or unsubstituted (C1-C10) aminoalkylaminocarbonyl, a substituted or unsubstituted (C1-C10) aminoalkylcarboxamido, or a substituted or unsubstituted (C1-C4)alkylacetamide(C1-C4)alkyloxy(C1-C4)alkyl.

A method of marking a substrate, comprising:

• contacting the substrate with a composition comprising a material with a substructure
• 9
• contacting the composition with energy sufficient to produce a change in the composition that can be detected optically,
• wherein each of R1 through R4 is independently selected from the group consisting of hydroxyl, a substituted or unsubstituted (C1-C10) alkyl, a substituted or unsubstituted (C1-C10) hydroxyalkyl, a substituted or unsubstituted (C1-C10) alkyloxy, a substituted or unsubstituted (C1-C10) alkyloxy-(C1-C10) alkyl, a substituted or unsubstituted (C1-C10) alkylamino-(C1-C10) alkyl, a substituted or unsubstituted (C1-C10) aminoalkyl, a substituted or unsubstituted aryl, a substituted or unsubstituted (C1-C10) hydroxyaryl, a substituted or unsubstituted (C1-C10) aryloxy, a substituted or unsubstituted (C1-C10) aminoaryl, a substituted or unsubstituted arylalkyl, a substituted or unsubstituted C1-C10 haloalkyl, a substituted or unsubstituted C2-C6 alkenyl, a substituted or unsubstituted C2-C6 alkynyl, oxo, a substituted or unsubstituted (C1-C10) aminoalkyloxy, a substituted or unsubstituted (C1-C10) aminoalkylcarboxy, a substituted or unsubstituted (C1-C10) aminoalkylaminocarbonyl, a substituted or unsubstituted (C1-C10) aminoalkylcarboxamido, and a substituted or unsubstituted (C1-C4)alkylacetamide(C1-C4)alkyloxy(C1-C4)alkyl.