though not necessarily enlightening collectors any more than previously. References Bibliography Herendeen, David L., Thomas Lera, James A. Allen, Philatelic Shade Discrimination Based on Measured Color. Institute for Analytic Philately, Inc., 2010 http://hdl.handle.net/10088/17132 White, R. H. (Roy H.), Color In Philately. New York: The Philatelic Foundation, 1979 175p. Leon Norman Williams, Fundamentals of Philately (American Philatelic Society, 1990), chap. 13 "Inks and Color" External links Texas Precancel Club's chart of variations seen in stamp color names Stamp collecting Philatelic terminology