As a colorist, I am disgusted by the color change acrylic paint undergoes as it dries. the image below demonstrates the change:
The color scale is based on the RGB scale of Raw Sienna to Raw Umber: the A corresponds to Raw Umber; A# and B are two steps below it short of gray. Raw Siena is analogous to C.
This means I will have to return to oil paints. I will finish the two I am currently working on, but most of the work done in the past four years is worthless.