What's the easiest way to accelerate browning of copper?

Comments

• longtimecollector Posts: 2,368 ✭

  May 31, 2007 5:27AM

  
  
  Remember this scene from the movie ???

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• eyoung429 Posts: 6,374 ✭

  May 31, 2007 5:28AM

  Well, you first take a copper and then after giving it to a 2yr old...............

  This is a very dumb ass thread. - Laura Sperber - Tuesday January 09, 2007 11:16 AM
  
  Hell, I don't need to exercise.....I get enough just pushing my luck.

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• Oldnewbie Posts: 1,425 ✭✭

  May 31, 2007 5:48AM

  Deller's Darkner?

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• ricko Posts: 98,724 ✭✭✭✭✭

  May 31, 2007 5:55AM

  Put the coin close to a heat source - i.e. bunsen burner... or, in an oven that has been heated to 200 degrees F.... The copper will oxidize and turn brown. If you want to return it to original bright copper, flood it with hydrogen... Cheers, RickO

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• UncleJoe Posts: 2,551 ✭✭✭

  May 31, 2007 6:08AM

  Put it on a sunny windowsill. When the first side is done to your liking turn it over and repeat for the other side.
  
  Works like a charm "naturally" but takes a little time. The "browning" will look completely original.
  
  Joe.

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• DHeath Posts: 8,472 ✭✭✭

  May 31, 2007 6:16AM

  Thanks guys. I've got a few low grade uncs I'd like to match the brownies in a folder.

  Developing theory is what we are meant to do as academic researchers
  and it sets us apart from practitioners and consultants. Gregor

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• cladking Posts: 28,731 ✭✭✭✭✭

  May 31, 2007 7:10AM

  
  
  << <i>Put the coin close to a heat source - i.e. bunsen burner... or, in an oven that has been heated to 200 degrees F.... The copper will oxidize and turn brown. If you want to return it to original bright copper, flood it with hydrogen... Cheers, RickO >>
  
  
  
  This is the way I do it.
  
  If it's ugly then I'll soak it in olive oil first and then strip it with acetone and alcohol.
  
  If it looks nice then I'll usually just strip it first just in case it has a little oil or dirt on it.

  tempus fugit extra philosophiam.

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• OffCenter Posts: 349 ✭

  May 31, 2007 7:17AM

  
  
  << <i>Deller's Darkner? >>
  
  
  
  I heard that Dellers Darkener was nothing more then petrolium jelly ........ or vaseline. Is this true?

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• lathmach Posts: 4,720 ✭

  May 31, 2007 7:36AM

  Mitee brand sulphur based thread cutting oil. Experiment on junk lincolns.
  I used this cutting oil in my machine shop and when machining copper it turned it a nice brown color.
  
  Ray

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