Transcript COLOR •Mixing Colored Pigments •Why the Sky is Blue •Why Sunsets are Red •Why Water is Greenish Blue.

COLOR
•Mixing Colored Pigments
•Why the Sky is Blue
•Why Sunsets are Red
•Why Water is Greenish Blue
Mixing Colored Pigments
The mixing of paints and dyes is an entirely
different process from mixing colored light.
Pigment: a material that selectively absorbs
colored light.
Mixing Colored Pigments
This is called color mixing by subtraction.
Mixing Colored Pigments
Subtractive Primary Colors: The colors that are
most useful in color mixing by subtraction.
Magenta, yellow and cyan.
Scattering
Violet light is scattered the most, followed by blue, green, yellow,
orange, and red, in that order.
The tinier the particle, the higher the frequency of light it will scatter.
Why the Sky Is Blue
The sky is blue because its tiny particles scatter
high-frequency light.
Although violet light is scattered more than
blue, our eyes are more sensitive to blue, so we
see a blue sky.
Why Sunsets Are Red
At sunset, the light has to go through more
atmosphere than at noon.
Red light can pass through more atmosphere without
scattering than blue light.
Why Water Is Greenish Blue
Water somewhat absorbs visible-red frequencies.
What happens to white light when red is taken away?