Photo-Eneraver* Board of Trade. New York City.

Halftone Screen Tints.

There were eight halftone screen tints in each of these series, but only every other one is reproduced here. Vz V4 1 Vz 'A 1 % V4

The "1" indicates a full color value.

"'/a" a half screen and "54" *

quarter screen. Those colors that are checked (r )

are the ones used generally in this

book. Because of the possibility of patterns,

the colors marked x" have not

been used. The small areas of color between the

combinations of color are helpful

in determining the colors and

color values that are combined in

adjoining sections.

Colors and Possible Combinations of the Colors Used in This Book.

Because enough tints and shadings of color may be obtained by using half screen and quarter screen colors, the combinations of colors shown above that would require a double screen have not been used in this book.

For an example of color combinations, see 186.

PREPARATION OF ILLUSTRATIONS

When color is used in printing a pamphlet or book, "tints' of the color or colors may be used to secure shading instead of using cross hatchings. However, because the areas for color tints usually are irregular in shape and require more skill in applying them, the cost of color tinting may be greater than the cost of the halftones.

One definite problem arose regarding the use of the color "green." As shown opposite, green may be secured from a combination of full yellow and full blue. If this "combination" green were used, both blue and yellow color plates and an extra press run would have been necessary, whenever green was wanted. As a result, a green ink was used instead of the "combination" green in some chapters.