However, I also need one that is relatively dark and one that is relatively bright. French Ultramarine and one Green Shade Cobalt Blue. However, I need at least two blues in my palette.
If I use red, it contributes sufficient yellow to the mix, I have found. I agree that Cobalt Blue is lighter than French Ultramarine, and practically all of above. Ultramarine is the standard warm blue, a brilliant blue pigment that has the most purple and least green in its undertone. Yep, I usually mix in a bit of a “pink” (magenta, or red), mixed with a bunch of white, right near the horizon. I’ve used Prussian blue, Titanium white, and yellow ochre for one sky on a limited palette last November during a plein air session. The deepest thing to be learned is the variation of colors from horizon to zenith, and what Bill said, “Each with a ton of white.” The best advice I would offer, now that it’s spring, is to take your paints outside and study, analytically, the colors of the sky where you are at different times of the day. (That one was a cobalt pigment, the chemical composition of which was discovered by the French chemist Louis Jacques Thénard in 1802.). In Massachusetts when I’ve been there, the skies need much more white, I suppose because of the moisture in the air. They are not very different in hue, but very different in characteristic. Additionally, cobalt blue is more opaque and can be used to achieve different levels of. Cobalt blue is brighter and more vibrant than ultramarine blue, while ultramarine blue is more subtle and has more of a greenish-blue hue. Here it’s somewhere between Cerulean and Cobalt except when the dust’s up, then there’s orange and red. Cobalt blue is a pigment made from cobalt, while ultramarine blue is made from lapis lazuli, a semi-precious stone. In New Mexico, I go for more Manganese and less Pthalo. Sky temperatures vary with locale and season. I’ve mixed pale lemon into white for some horizons, and grays and red dust colors are sometimes apparent there. That is the way I do my skies, Bill! Except, right at the horizon line, I very seldom find any blue at all. This 10ml tube of Cobalt Blue Ultramarine 512 is formulated with pigment(s) PB29/PW6, is transparent, and has a lightfastness rating of +++ (at least 100 years.
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