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Unread 05-31-2004, 05:16 PM   #64
Groth
Cooling Savant
 
Join Date: Mar 2003
Location: MO
Posts: 781
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The discoloration is from heat induced oxidation -- ya need the copper mighty toasty to braze it. It doesn't appreciably alter performance, but if you don't like it in there, a rinse with caustic soda (sodium hydroxide) will clean it off.
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