Red, blue, and yellow constitute the primary colours on the color wheel.
Mixing two primary colours produces secondary colours, such as green, orange, and purple.
Tertiary colours result from combining a primary colour with an adjacent secondary colour.
This positioning explains their placement on either side of the secondary colours on the color wheel.
Color temperatures are described as warm and cool, but this does not dictate their placement within the color wheel's structure.
Consequently, colours situated on either side of secondary colours are designated as tertiary colours.