The Caran D’Ache Brush with Water Reservoir is a really useful tool for watercolourists, especially those working en plein air who don’t want to mess around with pots of water. You simply fill the reservoir, then screw on the brush, which has nylon bristles. When you need to add water, squeeze the brush gently to wet the bristles. You’ll find the Caran D’Ache Brush with Water Reservoir a straightforward and mess-free way to add water to watercolours or water-soluble pencil drawings.