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E will now turn to Plate 32, which is equal in importance to the key plate. Plate 1 is the key to the mixture of colors, and Plate 32 is the key to the correct combination of colors.

Plate 32.—This plate represents the colors of the solar spectrum, arranged in a circle so as to bring colors which are complementary directly opposite to each other. In combining colors there is a wide difference of opinion as to what is correct and what is not. Of course, when harmony is produced, that is certainly correct. But the question with printers the world over is: what rule can be safely followed to obtain harmonious results in the combination of colors? The writer confidently believes that the color chart on Plate 32, with the rules and explanations which follow, will in a great measure fill this very long-felt want.

Having made a close study of the works of the best writers upon the subject of color, during the past six years, and also, having made a great many original experiments in the combination and mixture of colors in the same time, we reached the