Dr. Ph. Martin's Synchromatic Transparent Water Color colors are easy to handle and give ultimate transparency. Ideal for use in airbrushes. Designed specfically for work that requires more transparency, such as retouching, hand coloring for photographic papers, and films. Each liquid color comes in an iconic 0. 5 oz (15 ml) glass bottle package with its own eyedropper. Like all aniline dye base colors, they are fugitive when exposed to direct sunlight over time. For lightfast, archival watercolor use Dr. Ph. Martin's Hydrus Fine Art Watercolor. 38 colors are available.