Process for producing dioxazine violet pigment

摘要

A process for producing stable ( beta -type) dioxazine violet pigment having superior gloss and tinting strength to the metastable ( alpha -type or a type analogous thereto) dioxazine violet pigment, by mixing an aqueous suspension of a metastable dioxazine violet pigment with an acetate or ketone compound and then heating the mixture. The metastable dioxazine violet pigment may be that obtained according to the conventional method, and employable in situ.