I find colour mixing one of the most difficult things. It is always a challenge for me. If I'm honest, I don't know if I hate it, or if I love it. I needed to mix a batch of acrylic - enough for several coats to cover a largish area - of a particularly peculiar pink. My 'swatch' is a teeny piece of coloured paper (similar to the sort of tinted bond paper that was once used when making carbon copies on a typewriter), but I got there much more quickly than I had hoped. I call that a result.