Max G. Johl

Not a color study, but essentially an article containing color information, was published by Max G. Johl in 1935-37 in his textbooks United States Postage Stamps of the 20th Century. A reproduction of Johl’s work was published by Quarterman Publication in one textbook in 1976. “The Eleven Cents Stamps Grouped” section in the book, mentions the following shades, but does not link them directly to plates:

pale peacock blue	light peacock blue	bright peaccock blue
peacock blue	deep peacock blue	bright blue
deep bright blue	pale greenish blue	light greenish blue
greenish blue	turquise blue	light turquise green
turquise green	pale green	light green
yellow green	bright green	green
deep green	pale milky blue	light milky blue
milky blue	light milky greenish blue	milky greenish blue
greenish blue

Descriptive terms like pale, light, bright, and deep represent the effect of value and chroma on hue.

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