Hi Hans, \def\colo_groups_define_entry#1#2#3% name mode specification {\advance\c_colo_groups_n\plusone - \csname\??colorgroupsetter\ifcsname\??colorgroupssetter#2\endcsname#2\else\s!rgb\fi\endcsname[#1:\the\c_colo_groups_n][#3:0:0:0:0]} + \csname\??colorgroupsetter\ifcsname\??colorgroupsetter#2\endcsname#2\else\s!rgb\fi\endcsname[#1:\the\c_colo_groups_n][#3:0:0:0:0]} Wolfgang