Van Gogh water colours are rated as a student and artist level paint range. They feature brilliant, transparent, and intense colours with high tinting strength. Thanks to the purity and uniform viscosity, these water colours are easy to work with and easy to mix. Proudly produced in Holland with stringent quality control for a consistent experience with every purchase. This half pan of Ultramarine Deep 506 is formulated with pigment(s) PB29, is transparent, and has a lightfastness rating of +++ (at least 100 years lightfast under museum conditions).