Patent ID: 8771411

Claim:
A method, comprising: reacting a pigment with a diazonium salt comprising a 5-membered heteroaromatic ring and a diazonium group directly bonded to the 5-membered heteroaromatic ring, thereby forming a modified pigment that comprises the 5-membered heteroaromatic ring; wherein the 5-membered heteroaromatic ring comprises three ring heteroatoms, at least two of which are nitrogen atoms, and wherein the diazonium salt comprises 1,2,4-triazolyl, 1,2,3-triazolyl, 1,3,4-thiadiazolyl, 1,2,4-thiadiazolyl, 1,2,3-thiadiazolyl, 1,2,5-thiadiazolyl, 1,3,4-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,3-oxadiazolyl, or 1,2,5-oxadiazolyl or a compound of formula: