Colours
Our world is full of colours. Colour blind people think there's no colour in our world.
Red, Yellow and Blue are the primary colours of traditional painting.
Secondary colours:
Red+Yellow=Orange
Red+Blue=Purple
Yellow+Blue=Green
When inverted:
Red=>Green
Yellow=>Purple
Blue=>Orange
Red, Green and Blue are the primary colours of light.
Secondary colours:
Green+Blue=>Cyan
Red+Blue=Magenta
Red+Green=Yellow
When inverted:
Red=>Cyan
Green=>Magenta
Blue=>Yellow
List of colours
Other things you can know:
Most animals are colour blind. A bull charges at a red cape because it is waved then it's not because of red. EVEN OTHER THAN RED!