why are primary colors called primary?

colors - primary colors.
Philippines
April 20, 2007 8:52pm CST
how were they able to categorize it as primary? and why are those colors called primary?
1 response
@judyt00 (3504)
• Canada
21 Apr 07
Primary means first or pure. They are not a mix of other colours. the primary colours are red yellow and blue. anything else is a secondary or tertiary colour.