Quote Originally Posted by Tony Egan View Post
My advice is to forget about using the colour head and stick to graded filters under white light.
Did you mean graded papers under white light?

BW enlarging papers are not sensitive to red light, therefore cyan filtration is not needed. MC papers achieve contrast variation through the use of blue and green sensitive emulsions, hard and soft contrast respectively. Magenta filtration controls hard (blue) and yellow (green) filtration controls soft contrasts. Sometimes you use both.