A coloring composition for image formation comprising an azo dye having an
aromatic nitrogen-containing 6-membered heterocyclic ring as a coupling
component, a coloring composition which comprises an azo compound having
an oxidation potential nobler than 1.0 V vs. SCE and comprising at least
two substituents having a pKa value of -10 to 5 in water, and a method
for improving ozone resistance of a color image, the method comprising
using a compound having an oxidation potential nobler than 1.0 V vs. SCE
and showing a maximum absorption at a wavelength between 500 nm and 580
nm with a half-value width of 150 nm or narrower.