You would think, after using acrylics for as many years as I have, that their propensity for darkening as they dry would be no surprise to me. Call me a slow learner--I still find myself peeved when the perfect shade of blue/violet morphs into a garish purple an hour after I apply it.
The piece on which I'm working is a sunset scene--very moody (not muddy! I hope) with a pinky golden glow below the not yet achieved blue/violet sky.
This problem is why I have purchased a set of water soluble oil paints to experiment with. Trouble is, I'm afraid to tackle them. It feels like I'd be putting myself back about twenty years, using a whole new medium. Now that I'm looking with honesty at the painting I've been struggling with, I think I have to give them a try.
Not that I'm giving up on this piece...I rarely do that. Acrylics are great for correcting, over-painting, glazing, and generally re-doing a whole painting. So the dark orange glow can be muted by adding a pale yellow blended coat over it. The purple sky needs both darker blue and lighter lavender areas. The snow-covered ground's chroma is too high; I need to gray it down and lighten it a bit.
So tomorrow in the nice morning sun I will adjust, tweak, and correct until I begin to see the light at the end of the tunnel. If I don't see that spark of promise after that, I'll have to concede the point: Acrylics can be a total pain in the butt!