1. Color

2. Adding Colors
White light can be split up to make separate colors. These colors can be added together again.
The primary colors of light are red, blue and green:
Adding blue and red makes magenta (purple)
Adding blue and green makes cyan (light blue)
Adding red and green makes yellow
Adding all three makes white again

3. Only red light is reflected
Seeing color
The color an object appears depends on the colors of light it reflects.
Pigments absorb colors, reflecting or transmitting only some
For example, a red pigment book only reflects red light:
Homework
White
light
Only red light is reflected

4. Subtracting Colors
Pigments absorb colors, that is they subtract colors
Mixing all pigment results in no color
That is Black!
The “Primary colors” of your youth were really the primary pigments Or “Subtractive” colors

5. A pair of purple trousers would reflect purple light
(and red and blue, as purple is made up of red and blue):
Purple light
A white hat would reflect all seven colours:
White
light

6. Using filters
Filters use pigments to “block” out different colors of light:
Red Filter
Magenta Filter

7. Using Colored light
What color we see depends as much on the colors of light hitting an object as the pigments in it
For example, consider a soccer uniform:
Shirt looks red
White
light
Shorts look blue

8. In different colours of light this uniform would look different:
Red
light
Shirt looks red
Shorts look black
Shirt looks black
Blue
light
Shorts look blue