Lenton58, knowing color thoery really comes in handy. From a former life and occupation, I have bulldozed myself into the auto paint supplier's color mixing room, "show me your toners..." . One thing to note is that when you start mixing colors, chroma (brightness , intensity) falls off pretty fast. If a color is bright, the closer you are to begin with the better.


And indeed, black is as big a challenge as white. There are bunches of ways to push black, often done with red, yellow on more modern stuff. Sometimes blue and red. And not always a pigmented toner, but translucent. A color I would hate to shoot would be one of the new black metallics, or Micas. Heaven help the guy who is asked to spot blend the hue flopping metallics that Ford used on one of the special Mustangs a few years ago, $400. A quart at the time.