I've had a few asking about the waste solvent so this is what the stages are.
The middle one that's kinda of pink in color is what the painter dumps into a five-gallon drum what's left over after they mix paint color and finish the paint job. The painter always has a few oz's left over, from each job. This drum gets all color and products that don't have a hardener in them.
They then dump the five-gallon waste drum into the paint recycler. The one on the left is cake what's left over after it's been recycled. The cake can be dumped into the trash because it no longer has solvent in it and is just dry paint.
The one on the right is the clear bi product that is basically all the solvents in the paint and the reducers they use to thin the paint to spray it through the gun.