Man's physical universe

xanabras

COLORS ARE PORTIONS OF VISIBLE SPECTRUM 419

consist of mixtures of two primary colors. Tertiary colors are those

made by mixing a primary color with a secondary color.

Colors produced by mixture are more likely to be pleasing than pure

colors used next to each other, which may produce too sharp a contrast.

Expressed in another way, mixed colors are likely to be more

subtle.

A general rule when using any primary color is to use with it the

colors on either side of its opposite to produce a softer effect; for example,

good harmonies might be produced by using yellow, orange, and

red-orange; the complementary colors produced by interference using

polarizing screens always harmonize.

In advertising, primary colors are used in large amounts next to

each other in order to obtain attention. If you want to attract the

attention of everyone who sees you, try wearing a yellow hat, with red

pants or skirt, and a green coat.

There is a symbolism in color usage that is due in part to association

and in part to sensation. Red lights signify danger and are associated

with stimulation and excitement. Orange and brown are associated

with warmth. Yellow is light, while blue is thought of as a cold color.

Warm colors are said to be advancing while cool colors are receding;

for example, in a landscape the foreground iswarm, and the background

is cool. Red, orange, and yellow are advancing colors, while violet,

blue, and green are receding colors. Weight is indicated by dark

values, while light values suggest less weight.

The smaller the area the

brighter the color is a statement of the law of areas in colors.

STUDY QUESTIONS

1. Describe two methods of producing the spectrum.

2. What is meant by dififraction of light?

3. Why do prisms refract light?

4. Explain how the eye sees different colors.

5. What is meant by complementary colors?

6. Why does a red light carry better than a white light in a misty atmosphere?

7. What is the source of color in an object?

8. Why does the eye see green when white light is viewed after looking at red

light for a short period of time?

9. How do pigments destroy color?

10. Discuss the causes of the color of the sky and clouds.

11. Explain rainbows. How is a secondary rainbow produced? Do you think

that it would be possible to produce a tertiary rainbow, and if so, how?

12. Explain the formation of halos.

13. How are colors of soap bubbles produced?

14. Although kerosene is a colorless liquid, a trace of it on the surface of a pool

of water will give a variety of colors. How are these colors produced?

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