Skins of animals and of trolls are evidence of an unredeemed nature. In alchemy the anima may wear dirty clothes and, in alchemical parlance, be ‘the dove hidden in the lead.’
Von Franz reads animal skins as symbols of psychic contents still imprisoned in an unredeemed, instinctual state, directly paralleling the alchemical motif of the hidden soul awaiting liberation.
, The Interpretation of Fairy Tales, 1970thesis