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The Filbert Paintbrush is one used in artwork. It has a thick ferrule and hairs that are, on average, medium to long hairs in the shape of an oval. Filberts are particularly effective in blending work, usually of a figurative nature. Many artists agree that natural fibers/fibres work best for filberts because the hairs stick together better when wet.

Hairs that can be used are sable, mongoose, bristle, badger and synthetic. Media most likely to have paint applied to by a filbert are oil, acrylic and decorative surfaces.^{[clarification needed]} This brush is mainly used on The Joy of Painting as one of the main brushes.

[edit] History

The filbert paintbrush derives from the shape it resembles, that of a hazelnut with its namesake. This word comes from the Old French filbert, coming from nois de (nut of) Philbert. Philbert was a saint, (who died in 684), whereby the ripening of the nut in August coincides with his feast day.