Why were the hound's Jaws coated with phosphorous in The Hound of the Baskervilles?
The hound's jaws were coated with phosphorus to make it look ghostly, demonic, and supernatural. As Watson describes it, it is:
not such a hound as mortal eyes have ever seen. Fire burst from its open mouth, its eyes glowed with a smouldering glare, its muzzle and hackles and dewlap were outlined in flickering flame.
The phosphorus coating its jaw makes it looks as if fire is bursting from its mouth, whereas this is simply a special effect. However,...
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