Do all fibres felt?
No. The fibres have to be woollen, with a long ‘staple’ (length of hair), crimped in nature, and fine. Wool fibres have scales, and these are the very scales that enable the fibres to tangle together during the felting process. Silk, cotton and flax fibres, for instance, do not have scales, and therefore are unable to felt together on their own. They need to have wool fibres combed in with them before they are able to felt together.