TAPPI T 1215 sp-21:2021 Edition

This standard practice provides a general introduction to the use of color differences and a list of the most widely used equations to obtain them. Color differences can be used 1) as a guide to establishing color tolerances in the production of pulp, paper, and paperboard, 2) for the determination of buying and selling tolerances of color, 3) to provide a method of determining the adequacy of color matches.