The practical colorist : a pathfinder for the artist printer (1900)
Sheldon, Frederick M. (Martin) · Burlington, Vt. : Owl Press · leaf 42
OPTICAL ILLUSIONS … Cover all the figures except the one to be studied, then look steadil}^ at it for a moment or more, when upon look¬ ing at a white surface you will see a pale tint which is the complementary of the color viewed. Look at the shield in the same manner as is described above and on looking at a white…
Color printing · Illustration of books
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
