Derwent Spritzer.
The Spritzer adds a new creative dimension to your water based work.
Spray water directly over water-soluble drawings to create interesting textures, colour runs and dribble effects.
You can also dissolve colour pigment using Derwent Inktense or watercolour into water & fill the Spritzer, then spray colour directly onto your image.
Many artists will also spray water lightly over paintings to maintain a wet workable area.