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Pigment question

I am working on a project for a paper mill, which pulps, bleaches and dyes softwood and hardwood fibers. We are trying to encourage them to use less bleaching for paper that they are going to subsequently color. In this case they produce pink and yellow form stock for carbonless paper forms. Is more or less pigment needed for papers that are unbleached or bleached less than ISO 88 to 90, before coloring them pink or yellow? Also would there be benefit to using non-wood pulp for this type of application ie. less pulping, bleaching, or coloring chemicals?
David A. Foulkes, Environmental Specialist
State of Ohio EPA
Office of Pollution Prevention
P.O. Box 1049
Columbus, OH  43216-1049
(614) 644-3118
FAX: (614) 644-2807
email:  dave.foulkes@epa.state.oh.us
World Wide Web:  www.epa.state.oh.us/opp