What are the primary colors?

Red, Yellow, Blue

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Colour Theory Tutorial - Watercolours and Pastels by Peter Saw
"There are three Primary colours: RED, YELLOW and BLUE. Primary colours cannot be created by mixing other colours."

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Yes, red, yellow and blue - normally for a student's understanding. However, what the primary colors are can also be dependent on the application or process for which they are used. The quote below is from the following site. Primary color - Wikipedia, the free encyclopedia

Quote:

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Primary colors are sets of colors that can be combined to make a useful range (gamut) of colors. For human applications, three are often used; for additive combination of colors, as in overlapping projected lights or in CRT displays, the primary colors normally used are red, green, and blue. For subtractive combination of colors, as in mixing of pigments or dyes, such as in printing, the primaries normally used are magenta, cyan, and yellow.[1]
Any choice of primary colors is essentially arbitrary; for example, an early color photographic process, autochrome, typically used orange, green, and violet primaries.[2]

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