One of the physical properties of wool is its hygroscopicity or power of absorbing moisture.
hygroscopicity and "working" are reduced but not eliminated by thorough drying.
According to Seger this hygroscopicity distinguishes true clay from silt and dust.
The hygroscopicity of the sand of the coast of Jutland he found to be thirty-three per cent.
hygroscopic hy·gro·scop·ic (hī'grə-skŏp'ĭk)
Readily absorbing moisture, as from the atmosphere.