fermis
"Close" counts in horeshoes, hand grenades and scale modeling!
Slow dancing too. I don't so much agree with modeling, cuz I own a business that has a color genius on the payroll. Color has hue, and that can be made up, but it also has value i.e. degree of darkness and that one is hard to get right in paint.
Here's the problem. Like as you might, paints are not made up from some universal and perfect supply of RGB or YGB or magenta cyan yellow or pantone colors or whatever. They are alchemic creations based on strange pigments that the in house scientists have found to work.
Likewise white isn't really white, and black is NEVER black.
So when you mix them, experience will tell you, they go off into strange and wonderful reactions, usually based on a shade of dark green. Or vomit. But they are very hard to control and bear no relation to the chroma wheel.
About the best you can do is tag along on forum dicsussions where folks ll say "4 parts tamiya orange to 1 part model master yellow".
Model paints are the worst of the lot because they are marketed to people who never would mix them up.
Artist paints on the other hand work well. Try mixing acrylics in the tube if making your own colors strikes your fancy.