Patent ID: 8471036

Claim:
A rhodacyanine derivative represented by the following Formula (1): wherein, in Formula (1), R 1 , R 2 , and R 3 each independently represent an alkyl group which may be substituted; X represents a counter anion; and Y 1 and Y 2 are represented by at least one combination of Y 1 and Y 2 selected from the group consisting of: Y 1 represents a hydrogen atom and Y 2 represents a fluorine atom, Y 1 represents a fluorine atom and Y 2 represents a hydrogen atom, Y 1 represents a chlorine atom and Y 2 represents a fluorine atom, Y 1 represents a fluorine atom and Y 2 represents a chlorine atom, and Y 1 represents a fluorine atom and Y 2 represents a fluorine atom.