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I have never worked with the Japanese enamels,so really can't tell
you whether or not people using them have failures due to not having
access to the COE's.
For information about the Japanese enamels, I suggest you contact
Coral Schafer (Sp), at Enamelworks. Coral sells the Japanese enamels
and may have charts giving essential information abut them. Coral
also makes extensive tests on everything that she sells, and
willingly shares this information.