This 30ml bottle of Dr. Ph. Martin's Bombay India Ink in Yellow is lightfast, permanent and waterproof when dry. Use on paper, wood, plastic, vinyl and board and for rubber stamping, lettering and watercolour techniques. Its free-flowing formula works with dip pens, technical pens, brushes and airbrush. Bombay India Ink can also be diluted with water. Made in the USA.