Primary Pigments are blue, red and yellow. We can not produce them by mixing other hues. Secondary Pigments are green, orange and purple. We can create these colors by mixing other hues. Primary Light is blue, red and green Secondary Light is cyan, magenta and yellow.
Warm colors are red, orange and yellow.
They tend to pulsate toward the viewer. Hot things tend to burn red or orange. Cool colors are blue, green and purple. They tend to recede from the viewer. The color of the sky or ocean suggests a coolness in the colors of green and blue.