This is making me want to bust out my Mjello Prussian. I also have DS and Qor, and a tube of M. Graham gouache in this color. I don't know why I don't use it more in sketchbook.
I purchased M Graham Prussian Blue. I like it. It goes on smooth and dries evenly. It is highly pigmented and mixes with a number of reds to make some really beautiful violets. I love this comparison, though. I have a lot of D Smith and Mission Gold, and am always glad to see them in tests like these.
