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Torch "bloom"


#1

When I heat sheets of sterling I notice a change in color of the
surface as I move the flame. The colors range from copper color to
blues and other colors. The colors come and go as the flame moves.
Is this the silver oxidizing? I notice the effect most strikingly
when I have no flux on the silver such as when I am in the first
steps of reticulation and want to oxidize the surface. I have also
noticed it, but not as intensely, when I did have Pripps on the
silver and was trying to minimize oxidation. I am using a propane -
oxygen torch and try to keep a slight flicker of yellow in the torch
flame (hoping that means I have a reducing flame).

Mitch Adams


#2

Mitch What You are observing is the different metals being oxidized
and or burnt off into the atmosphere…Green is copper blue would be
the silver. Ringman John Henry