Dr. Ph. Martin's Radiant Concentrated Watercolors are produced in an extremely concentrated form to achieve the greatest possible brilliance. They're primarily formulated for use in graphic arts work on paper surfaces intended for reproduction. (e.g. cartooning, illustration, and other graphic arts), and are especially popular for airbrushing. Like all aniline dye base colors, they are fugitive when exposed to direct sunlight over time.
Colors come in .5 oz bottles with their own eyedroppers.