Patent US5318627 - Process for the preparation of pigment . - GoogleJun 7, 1994 . For comminution of dioxazine crude pigments obtained in highly . The grinding medium intended for the stirred ball mill comprises steel balls.dioxazine crude grinding by ball mill,Patent EP1194485B1 - Novel pigment form of Pigment Violet 23 .Apr 28, 2004 . According to DE 1 225 598, after dry grinding, dioxazine violet is ground further . and then ground in aqueous suspension in a powerful, high-speed ball mill. .. The process for converting a crude pigment into an substantially.
dioxazine crude grinding by ball mill