DANIEL SMITH Watercolour - 15mL - Cobalt Blue (PB28)This neutral, non staining primary blue will subtly modify most pigments. Considered a "mixing pigment", its transparent nature can cast a giant reticulating shadow. An inorganic pigment, it is considered transparent, non staining (or low tinting) and ideal for glazing methods. Its ability to create soft edges, to lift and to mix readily makes Cobalt Blue a valuable contribution to watercolour palettes. ASTM Lightfastness Rating: Excellent