“Reintroduced in 2012, "Indanthrone Blue, PB60, is a very dark, Semi-Opaque, highly staining color that was discovered in 1901. Sometimes referred to as Anthraquinone Blue, it has an ASTM Lighfastness rating of I, making it a good alternative to the fade prone natural Indigo which it was originally meant to replace. Both have a deep blue violet hue that is not overly-saturated and lends itself as a component for making a ‘blackless’ black. Indanthrone is a strong mixing color that does not overpower the way Phthalo Blue can. The tint it produces is strong in saturation of color but is muted in brightness lending itself to an earthier feel.”- Just Paint 2012 -Williamsburg