A process for conditioning organic pigments by grinding them in water in the presence of a grinding assistant, which comprises using as the grinding assistant an unsubstituted or phenyl-substituted aliphatic or cycloaliphatic 1,2-dihydroxy compound having 6 to 30 C atoms. The process gives pigments which have good dispersing properties in high molecular weight organic material.
This application is a continuation of application Ser. No. 352,710, filed May 11, 1989, now abandoned, which is a continuation Ser. No. 212,118, filed Jun. 27, 1988, now abandoned, which is a continuation Ser. No. 520,932, filed Aug, 8, 1983, now abandoned.
