Rembrandt watercolours are made in Holland of only the best materials. This professional-quality colour range is made from the purest pigments and purest quality gum arabic for brilliant and constant colours. This 10ml tube of opaque white is formulated with pigment(s) PW6, and has a lightfastness rating of +++ (100+ years under museum conditions). This series 1 watercolour paint has an opacity/transparency rating of opaque.