Blockx Watercolor Paint Set 12 x 15ml Tube Set with 12 tubes of watercolor paint, each 15ml, from Blockx. The extra-fine watercolors from Blockx have an exceptional lightfastness (rating 7/8 on the international BWS scale). The watercolors are made from rare, finely ground pigments that are encased in gum arabic and honey to enhance the durability of the colors and give them more shine and vibrancy. They offer a glossy finish and a creamy texture.