Dr. Ph. Martin's SYNC05OZS39 Synchromatic Transparent Water Color (39) Watercolor Bottle, 0.5 oz, Cerulean Blue Cerulean Blue (39) in a 0.5 oz glass bottle with dropper Transparent watercolor dye for retouching, hand coloring for photographic papers and films Also good for pen, brush, and airbrush One of 38 unique colors Made in the USA