abstract |
A toning agent for an azo pigment, an azo pigmentnwith a modified tone, and process for preparing the samenare provided. n 2-hydroxynaphthalene-3,6-dicarboxylic acid or anderivative thereof is admixed with a primary couplerncomponent for an azo pigment and the mixed couplerncomposition and an aromatic diazonium are coupled. |