dark ultramarine blue pigment
the dark ultramarine blue pigment is a polysulfurized sodium aluminosilicate, an imitation of lapis lazuli, which gives a slightly purplish navy blue color. Equivalent to majorelle blue or guimet blue (its creator) or klein blue. It can be used in all techniques and all binders, however with lime or cement the paint or the plaster must be used during the day.