<<Both violet and purple are a mixture of blue and red. Violet is more blue than red; purple is more red than blue and has the "plummy" look, whereas violet is more or less darker version of lavender and may be very dark indeed -- almost navy.>>

Is there a source for this, or does someone like Pantone give any guidance on it? A lot of people I know would simply use purple and violet interchangeably and indeed don't know the difference between the two. Where does mauve fit in the picture?