Harmonious Color Combinations of Cover or Text Stock and Inks.
Not all colors of inks may be effectively used with all the different colors of cover stocks. In Section 300 we gave the primary and secondary colors and these must be followed in choosing harmonious combinations of colored stocks, cover or text, and the inks used on them.

As one rule to follow, any primary color may be used with that secondary color into the composition of which the primary color does not enter. For instance, there is no red in green, blue in orange, or yellow in purple. Therefore use red with green, blue with orange, and yellow with purple.

Paper and Inks:
White: Crimson red; navy blue; emerald green.
Light Blue: Light red ; dark blue, light yellow, and yellow brown.
Dark Blue: Dark red and gold; light blue and white; green and orange.
Light Brown : Dark brown and silver; green, gray, and lilac.
Dark Brown: Black and white; light drab; orange.
Light Green: Yellow and dark brown; gold and orange; dark green.
Dark Green : Black and light green; gold and white.
Light Gray: Dark gray and red; dark blue and gold.
Light Red : Olive and gold; rich green ; blue and white.
Dark Red: White and gold ; dark green ; orange and dark blue.
Light Yellow : Light blue; red.
Black : Dark red; gold and white; light blue and silver.

In carrying out this rule do not use both colors in light tones. Let the blue, green, or purple be dark in tone and the orange, red, or yellow be light in tone.

The table of combinations of paper and ink on page 381 will be found helpful in studying color harmony.

Of course care must be taken in selecting the tints and shades to be used.

For dull-finished papers dull printing inks, as contrasted with glossy finished inks, should be used.

General Method for Figuring of Paper Stock for a Printing Job.
In taking up this section it will be necessary first to read Section 345 explaining the "imposition" of a printed form.

Assume as your problem to find the stock in pounds for a 64-page catalogue, using 25 x 38-70 stock, pages to be trimmed to 6 x 9 inches for an edition of 10,000 copies.

First we must recognize that there is an allowance for trimming of 1/4 inch front and 3/8 inch for top and bottom. Therefore 6 + 1/4 = 61/4 inches and 9 + 3/8 = 9% inches, giving you 61/4 x 93/8 as the untrimmed page size.

4 pages X 4 pages on one side of sheet.
16 pages X 2 = 32, number of pages to a sheet.
64 pages in catalogue = 32 pages to a sheet = 2 = number of sheets to a catalogue.

10,000 X 2 = 20,000 sheets, total number needed.
20,000 ± 500 = 40 = number of reams.
70 lbs. X 40 - 2800 lbs. = amount of paper.

In actual practice the problem would be modified some-what since an allowance must be made for make-ready .(see Section 337) and printing waste.

Printing-shop Waste Allowance.
The following table shows the usual percentage of printing-shop or factory waste allowance to be considered in connection with Section 324: