Watercolor Dirtbag
When I experimented to find my favorite blue for the sky, I focused mainly on the light blue midday sky, with a quick nod to deep dark night skies. These days, I find myself often drawn to the in-between gradient shades of dusk skies: inky night blue at the top, grading to pale muted cyan … Read more
Cobalt Blue is a bright middle blue, while Ultramarine Blue is more violet-toned. But Ultramarine Blue also comes in a range of shades, from a Green Shade that is almost identical to Cobalt Blue, to a more violet-toned (and usually more granulating) deep or French shade.
Phthalocyanine blue (PB15) is an incredibly intense, staining, transparent, non-granulating, lightfast pigment that comes in two versions:
(I’ll call them GS and RS in this post.)
What’s the difference, and which should you choose?