The Daler Rowney's Calli is a calligraphy and India ink made in England. It's an acrylic-based ink designed specifically for calligraphy. The Calli is actually available in different colours as well, namely Scarlet, Burgandy, Green, Blue, Scarlet, Brown and Jet Black India (the one I'm reviewing). It's also available and sold as a set of 6 colours too.
These are opaque, waterbased inks for use on paper, photos, negatives, acetate, and artwork. They can be diluted for perfect washes, and can be used with a brush, pen, or airbrush. Mix Pro Black with Pro White to produce opaque, cool grays.
A brilliant photo-retoucher’s white of high opacity. It's very smooth and responsive on all surface papers, photos and acetate and are preferred by most professionals, because it gives great coverage and won’t chip, crack or yellow. They may be applied with a brush or in an airbrush.