Indanthrone (indanthrene) PB60
The dye PB60 was developed by the German chemical company BASF in 1901, but it took until the 1950s before it was used as a pigment among artist’s paints. The idea with the pigment was to mimic indigo. The name comes from indigo + anthraquinone which is the raw material from which the dye is a derivative. Sometimes the color is called indanthrene which is actually an outdated term for all high quality textile colors.
The color is warm blue-black, it is significantly bluer than real indigo. The pigment is very light-resistant and semi-opaque, it is strongly staining and very intense dark warm blue, almost violet. The complementary color to Indanthrone is yellow-orange, you can mix it with e.g. raw umber for a gray blend.
You who like the color indigo (almost all indigo that can be bought today are mixed with other pigments) should try Indanthrone, it consists of a single pigment and it is intensely blue-black, much more beautiful than all ready-mixed colors.
Indantron is a color I use sometimes, when I do not need a clear blue for my painting, because its black content limits its use somewhat. But its intense warm blue hue is very attractive. A very nice color with some limitations.
Color index name: PB60
Transparency: Only semi-transparent