Blick Black Cat India Ink contains 100% natural resin pigment for a velvety, ultra black matte finish. Crafted with the same reliable formula for over a century, this non-toxic, water-based ink offers consistently smooth flow and can be diluted for delicate shading effects. It’s permanent, fade-resistant, waterproof, and archival—perfect for use with dip pens, technical pens, brushes, or airbrushes. - Blick Black Cat Waterproof India Ink - QuartBlack Cat India Ink, BLK QUART -