Dr. Martin’s Tech Inks are formulated for use in technical pens, but can also be used with a brush or even poured. These inks are dye based and highly pigmented for super bright color. Each of these drawing inks deliver maximum brilliance when used on watercolor paper, illustration board, vellum or they may be used on cotton fabrics as well. For some really great information about how these are the perfect addition to your ink art supply, check out the video “Designing Great Starts with Texture and Form” by Pat Dews. In this video she can show you how to use these inks like a pro! Each of these great ink colors is available from Cheap Joe’s in either an 8oz. or 1oz. bottle.