Abstract: The present invention relates to C. I. Pigment Red 254 for coloring, which can color an object to be colored so as to have a higher chroma than that with conventional technology and a production method for easily producing it. For the purpose, the inventors provide the production method for the pigment, wherein the intersection of mass tone ?H* and ?C* of a color coating film in an acrylic-melamine coating test is, on X-Y coordinate plane to which the ?H* is defined as the X-axis and the ?C* is defined as the Y-axis, within the surrounded region determined by specific three equations; and a production method for the pigment provides the production method of the pigment, including a process of heating crude pigment at 100-130° C. for 2-10 hours in an aprotic polar organic solvent which is strongly alkaline.

Abstract: The present invention relates to C. I. Pigment Red 254 for coloring, which can color an object to be colored so as to have a higher chroma than that with conventional technology and a production method for easily producing it. For the purpose, the inventors provide the production method for the pigment, wherein the intersection of mass tone ?H* and ?C* of a color coating film in an acrylic-melamine coating test is, on X-Y coordinate plane to which the ?H* is defined as the X-axis and the ?C* is defined as the Y-axis, within the surrounded region determined by specific three equations; and a production method for the pigment provides the production method of the pigment, including a process of heating crude pigment at 100-130 ° C. for 2-10 hours in an aprotic polar organic solvent which is strongly alkaline, which comprises the step of, prior to the heating process, beforehand, heating at 100-130 ° C.