Note that it must be a capital c, and then enter the word!
/C0 1 red
/CO2 orange
/C03 light yellow
/C04 light green
/C05 cyan
/C06 Purple
/C07 Pink
/C08 light yellow
/C09 Black
/C 10 green
/C 1 1 dark red
/C 12 bright red