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 end of the twelve. Then we mixed Nos. 2 and 3, 2 and 4, 2 and 5, etc., to the end of the list. We did the same with 3 and 4, 3 and 5, 3 and 6, etc., until all of the twelve colors had been tried. The result was about one thousand different colors. Then we proceeded to select the colors which we desired to show in this book.

The different colors produced by the mixture of two colors would in some instances exceed one dozen. In such cases we would select three or four which were as far removed from one another and the two colors used to produce them, as possible. For instance, Figures 33, 34, 35, and 36, on Plate 4, were made of red and black; 33 being the nearest to black, and 36 the nearest to red. In some instances we selected only one color from the different mixtures of two colors; for example, Fig. 28, Plate 3, which is composed of equal parts of red and rose lake.

We will now proceed to show a variety of colors produced by two-color mixtures, and explain the manner in which the proper proportions of each color were obtained. The reader will please note that in speaking of a combination of two or more colors to produce another color, we always refer to it as a mixture —a two-color mixture, three-color mixture, etc. When using the word combination, as two-color combination , we mean an impression of two different colors in one figure or design.

Plates 2 to 15, inclusive.—These plates show 112 colors produced by two-color mixtures, from the colors on Plate 1.

In printing these colors the cut represented above was used. It was engraved specially to show the effect of each color in solids, half-tone lines, quarter-tone lines, and tint lines.