The origin
Where this
came from.
Jugyeom has been made in Korea for centuries, but the
nine-firing sequence as it is practised today is largely traceable to
one man: Insan Kim Il-hun, a doctor of traditional Korean medicine who
in 1980 published a text that took the process from the two or three
firings then common to nine.
The number was not arbitrary to him. Nine carries weight in that
tradition. What is interesting, and what we have spent two years
measuring, is that the crystal does in fact change between the eighth
pass and the ninth — it melts. Whatever the reasoning behind the
number, something real happens at it.