Derwent-Inktense Blocks Tin. 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! This package contains twelve blocks in sun yellow, tangerine, poppy red, fuchsia, deep indigo, sea blue, teal green, apple green, leaf green, baked earth, bark and ink black within one tin. Conforms to ASTM D4236. Imported.