John Stewart Milne, Surgical Instruments in Greek and Roman Times
“ The cautery is nearly always spoken of as made of iron. Bronze becomes too soft to act well as a cautery, so that even the earliest references to the cautery in the authentic Hippocratic writings refer to cauteries as ‘the irons’ (σιδήρια) . It is true, of course, that in special cases bronze was used—and Priscianus recommends a cautery of gold or silver for stopping haemorrhage from the throat (Logicus, xxii) —but iron was the usual thing, and in spite of the enormous numbers of cauteries which must have existed only a very few have come down to us, as the iron has perished. ”
