I found out today that ultramarine blue refers to sulfur sodio-silicate blues in general, as opposed to just the blue for painting Ultramarines.
When a colour is called something like titanium white or cadmium yellow, it's pretty clear that the mineral composition is being referred to.
But sometimes it's hard to tell if you're just dealing with Crayola colours.
Boltgun metal though, no way that's a classic pigment.
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