What’s the difference between Cobalt Blue and Ultramarine Blue?

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.

Comparison of DV Cobalt Blue (PB28); WN Ultramarine Blue Green Shade (PB29); DV Ultramarine Blue (PB29); Holbein Ultramarine Deep (PB29); WN Smalt (PV15).

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