Artist brushes for watercolours need to be able to take a good load of colour and natural hairs such as goat, squirrel and sable perform better than most synthetic hairs.
Watercolour paints are made from finely ground pigments and water soluble binders such as synthetic glycol or natural gum arabic. They are available in block form as pans, or as a paste in tubes. The water soluble binders mean they will wash out of artist brushes quite easily with soap and water.
