Color problems; a practical manual for the lay student of color
Color Problems is a 1902 practical manual by Emily Noyes Vanderpoel, published in New York and London by Longmans, Green, and Co., written for lay students of color rather than specialists. Its plates are printed colour diagrams: grids of coloured squares, graded tonal strips, spectrum bands from a prism, and tables of complementary pairs. A designer could draw on their clean, systematic layouts for explaining colour relationships, contrast, and value steps through simple swatch arrangements.
