Re: Casein Emulsion and Tube Watercolor?
I would assume so, to some degree, but haven't tried it. The emulsion is very liquid compared to tube watercolor, so "a tiny dash" might be optimistic, depending on what behavior you're after.
The Spectrafix refill bottle (as opposed to the stuff in the spray bottle) hasn't been diluted with alcohol yet.
I would anticipate a better result from gouache mixed with the emulsion, the M Graham gouache I have is nice, and is less expensive than tube watercolor.
But Richeson's Shiva casein paint is much less expensive per oz. than either watercolor or gouache.
Hemmed & Hawn
Root, Bone, Sticks & Stone