I'm not really sure what you're on about Audioguru?, purple and violet are just slightly different shades of the same colour.
The three primary colours are Red, Blue and Green, you can mix these to get all the visible colours you want (as the monitor you're watching does!) - purple and violet are just Red and Blue, perhaps in slightly different ratios?.
Visible coloured surfaces (paint etc.) work differently though, Red, Blue and Green are the primary colours for LIGHT - this is an addative process, paint is a subtractive process, so the primary colours are different.
So your coloured suface (purple or violet) doesn't 'reflect' purple, it ABSORBS green - leaving the purple arrearance you see. So what you see is the light that hasn't been absorbed - which is where the subtractive part comes in!.