Patent ID: 7282164

Claim:
A stabilized ink composition comprising an IR-absorbing metal-ditholene dye and a singlet oxygen quencher, wherein the metal-dithiolene dye is of formula (II): wherein: M is selected from Ni, Pd or Pt; j is selected from 0, 1, 2, 3 or 4; k is selected from 0, 1, 2, 3 or 4; n is selected from 0, 1, 2 or 3; W is a hydrophilic group selected from the group comprising: a substituent comprising an ammonium group; a substituent comprising an acid group, including salts thereof; and a substituent comprising a sulfonamide group; up to three —(CH 2 )—groups in the carbocycle may be optionally replaced by a group independently selected from —C(O)—, —NH—, —S—, —O—; up to three —CH— groups in the carbocycle may be optionally replaced by —N—; up to four H atoms in the carbocycle may be optionally replaced by a group independently selected from C 1-6 alkyl, C 1-6 alkoxy, C 5-12 aryl, C 5-12 arylalkyl, halogen, hydroxyl or amino; and provided that at least one of j or k is greater than 0.