Dr. Ph. Martin's formulates these India inks for artists who need absolute permanence once the work is dry. Two distinct formulations address different surfaces and requirements. Hi-Carb delivers maximum density through high carbon content, creating opaque blacks that maintain crisp edges on acetate and film, essential for technical work where line integrity can't degrade. Matte finish eliminates light reflection on paper, illustration board, and canvas, preventing glare during photography or scanning while maintaining deep black values.

Both versions flow reliably through technical pens and calligraphy nibs without clogging, provided you clean tools promptly after use. Waterproof formula resists smudging and bleeding once dry, allowing overpainting with water-based media or handling without disturbing linework. One-ounce dropper bottles simplify refilling technical pens and provide controlled dispensing for dip pen work, no pouring from wide-mouth jars that invite spills or contamination. Choose Hi-Carb when working on acetate or when maximum opacity matters. Select Matte for traditional surfaces where you need absolute black without surface sheen.