RGB color modifier!

A RGB that changes colors (Colours... What are these Americans thinking? All hail the Queen!) with three potentiometers, one for each color (Colour! Blimey!)
So you can mix any of the colors (C O L O U R ! The Queen is not going to be happy!) There are 16 581 375 possible combinations, though they don't all look different but yea... that is a lot of colors... Colors! COLORS! I guess the English guy did himself a favo(u)r and went to have tea and crumpets lol! I don't mean to be racist...