The brush houses water in the barrel of the pen which is supplied to the fibre brush via a valve, giving a constant flow of water when the brush meets paper.
For wet on wet techniques just add slight pressure to the barrel of the pen, and to clean it simply apply pressure to the barrel and the dirty water will work its way out of the brush.
A bit about the brand: Derwent have long been producing high quality drawing materials and writing instruments. Since 1832, Derwent have been making pencils and accessories to suit every artist.
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