Berlin Blue composes the base of every other recorded color of blue, that Werner named in his Nomenclature. It also creates the secondary set of blues that Werner named as foundational, which include Greenish Blue (Sky Blue) and Greyish Blue (Cobalt Glass).
It is interesting to note that, in nature, the blues often appear on the feathers of birds or in copper ore, from the earth. Berlin Blue is basically a lighter, cooler Prussian Blue, which has more black and a bit of a mid-blue, which is indigo, folded together. Indigo and Prussian Blues are both found in Blue Copper Ore, Prussian also in cyanide. But Berlin Blue is the color of an untreated Sapphire.