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72 colors 8-ply Bristol ADJOINING artist assemble the three border or True Bottom Window chart color curves Chroma color combinations color harmony COLOR IN SCHOOLS color in terms COLOR LAWS color principle color theories color wheel Complementary colors CONTRAST Assembling degrees of contrast Faber Birren find our Blue full complementary Gamboge Gaugler higher percentages inside companion keys labelled 100 Leaf Green light rays mixing red numbers obtained by spinning opposite windows Ostwald percentages of contrast pigments progressively increasing degrees Prussian Blue psychologist pure color Purple Red sectors Right Window Sea Green secondary colors sensation sets of keys sets of three Spectrophotometer spectrum border split complementary STORY OF COLOR TEACHING OF COLOR three keys labelled three primary colors three-color theory top shield top window TRIADS True Color Circle turning the top violet visible spectrum Warm or Advancing wave lengths window shows yellow and blue Yellow and Red yellow with blue