Derwent Inktense blocks can be used dry or add water to create deep, intense colour washes. Due to its permanence once dried, Inktense doesn't wash away like watercolour so it can be worked over without affecting previous layers. XL Charcoal and XL Graphite blocks are extra wide chunky blocks, perfect for expressive mark making, blending and gestural work. These blocks will allow a variety of textures and effects by using on their side, edge, or corners.