Derwent Inktense Pencils are water-soluble - use them dry but mix them with water and the colour turns into vibrant ink! Once it's dry, the colour is fixed and you can work over the top of it, and because of it's permanent feature, it's great for using on fabric such as silk and cotton.
Experiment with different watercolour techniques to add some fun vibrancy to your fine art piece or use in unconventional ways to add some magic to your crafting projects.