Permanent when dry - doesn't washout like watercolour. Layer up inktense vibrant colours.Derwent Inktense pencils are our best watercolour pencil ever! You can use them dry but mix them with water and WOW! 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 it's permanent it’s great for using on fabric such as silk and cotton!