An objective is to provide a toner product with which the difference
between the water content of a toner in a toner container and the water
content of another toner present in an image forming apparatus is
minimized, and a sharp charging amount distribution can be obtained to
form high-quality images; and also to provide an image forming method
thereof. Also disclosed is a toner product in which a toner is stored in
a toner container, wherein the toner possesses a toner particle having an
amount of a carboxyl group present on a surface of the toner particle,
being 1.0.times.10.sup.-7-2.5.times.10.sup.-5 mol/g, and the toner
container is made of a resin containing polyethylene terephthalate, the
amount of the carboxyl group determined via titration employing a
strongly basic solution as a titration reagent after dispersing the toner
in water.