Williams, Alan R., 'Crucible Steel in medieval swords', Metals and Mines: Studies in Archaeometallurgy (London, 2007), pp. 233 - 241.
ULFBERTH will be spelled various ways between different examples; apparently those with high carbon content and a microstructure suggesting crucible steel have, so far, all been spelled the same way. Exciting stuff; I am most curious to see what trend emerges as more swords are analysed.
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