Chrome green and fast chrome green pigments can be prepared by dry or wet mixing.
Dry Mixing
The yellow and blue or green pigments are mixed and ground in edge runner mills, high performance mixers, or mills giving intimate contact of the pigment particles. Excessive increase of temperature must be avoided, because this can lead to spontaneous combustion [3.133]. Differences in the density and particle size of the components may result in segregation and floating of the pigment components in the coating systems. Wetting agents are therefore added to avoid these effects [3.134].