Dr. Ph. Martin's Iridescent Calligraphy Color, 1.0 oz, Iridescent Blue (7R) Iridescent blue (7r) in a 1.0 oz glass bottle with dropper Stunning colors with a pearl shimmer and shine and unmatched color intensity Lightfast, waterproof, archival grade color made from the finest ground pigments 24 Unique colors available across two different sets Made in the USA