For too long I've been meaning to grind up some pigments, rather than mix from dry each time I need a color. Today was cool, overcast, and humid, perfect outdoor weather to keep my grinds from drying out quickly. In fact, I even ground through a couple of showers. I now have three three raw umbers, two burnt siennas, and a burnt umber all bottled up.
There seems to be a bit of trouble with the green umber greenish. The pigment looked great when mixed with the palette knife but once more water was added and I began mulling, I noticed this distinct separation of pigment and a graphite black sheen. I'm not sure if this is to be expected. More on this after I hear back from Sinopia.