Go to the local art or craft supply store and get a kit for putting a patina on copper, it has an accelerator to bring out the blue and a stop to keep it from going further.   That may work and it only costs a few bucks.   I don't know any brand names.  

Pat  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Tuesday, October 11, 2011 1:06 PM
To: [log in to unmask]
Subject: [TN] Exposed Copper Detection

Is there a chemical application that can be used to discolor exposed copper such that it can be more easily detectible visually? In other words, is there a way to chemically accelerate verdigris or cause some other reaction to turn any exposed copper green or blue?

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