Derwent Graphik line painters pens are fine line paint pen with waterbased ink.
Derwent inktense blocks are easy to blend which can be mixed and layered to create an infinite range of hues and tints. These blocks are used silk and cotton.
The ink is heavily pigmented India Ink which is both lightfast and waterproof when dry. It will hold a line without spreading and flows smoothly without tip drying.