At SIUC’s Metalsmithing Programs we are spray etching with
Ferric Chloride. It’s a shop built rig. A Plexiglas box, (with
internally flanged lid) with an externally mounted recirculating
pump. There are two spray heads on each end of the tank spraying
at a removable Plexiglas mounting surface (3-D objects can be
suspended in the middle “target area”). Currently we are etching
copper and brass. The same unit can be used with Nitric Acid
(and possibly other acids as well?). Copper and brass can get an
effectively etched in 4 to 7 minutes. Supposedly you can dilute
the ferric to slow down the reaction if greater detail or control
is needed. I am this week doing a few experimental runs, but
seems to be a very quick effective system.
Impatiently awaiting Spring in Southern Illinois!
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