Patent ID: 7531667

Claim:
A two-photon absorption dye-containing material, comprising at least a two-photon absorption dye capable of decoloring itself through two-photon absorption and a decoloring agent precursor, wherein the two-photon absorption dye is a cyanine dye, a merocyanine dye, an oxonol dye, a phthalocyanine dye or a compound represented by the following formula (1): wherein R 1 , R 2 , R 3 and R 4 each represents a hydrogen atom or a substituent independently, or some of R 1 , R 2 ,R 3 and R 4 combine to form a ring; n and m each independently represents an integer of 0 to 4, provided that at least one of m and n is not zero, and when m is2 or more, R 3 s and R 4 s are independently the same or different, and when n is 2 or more, R 1 s and R 2 s are independently the same or different; and X 1 and X 2 each independently represents an aryl group, a heterocyclic group or a group represented by the following formula (2): wherein R 5 represents a hydrogen atom or a substituent, R 6 represents a hydrogen atom, an alkyl group, an alkenyl group, an aryl group or a heterocyclic group, and Z 1 represents atoms forming a 5- or 6-membered ring.