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John Burgess wrote:

G'day:  I have used the plate-off method, and it does remove
firestain.   You have to use the dreaded cyanide bath (sodium
cyanide; the potassium salt is much more expensive


Thanks for the info. I refuse to use cyanide in my shop. Is
potassium salt a safer even though more expensive way to deplate?
What is expensive?

Kenneth Gastineau