"These water-soluble blocks combine the versatility of Inktense pencils and the freedom of blocks, opening up an exciting world of endless possibilities. Perfect for covering large areas and creating free and expressive marks. Add water to create a pure, translucent, ink-like effect. Once dry Inktense becomes permanent so you can work over the top of it, and it's great for using on silk or cotton! Contains the complete range of 72 colours."