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» The Letterville BullBoard » Letterhead/Pinstriper Talk » How to remove metal oxide stuck on top of firegilded copper?

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Author Topic: How to remove metal oxide stuck on top of firegilded copper?
stein Saether
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Member # 430

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The local Nidaros Cathedral,http://en.wikipedia.org/wiki/Nidaros_Cathedral ,
is restoring its spire and gold ball.
Gold ball is an 80 cm diameter copperball, on it is attached firegilded copper parts; real shiny, except some places it is covered with brown metal oxcide, presumably iron coming from the the top cross.
.
Any ideas how to clean of to get to the gold beneath ?
.
I supposed I was to regild it, but no reason to destroy the nice old firegild if not nessecary, ist it ?

[ May 20, 2015, 06:04 AM: Message edited by: stein Saether ]

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Stein Saether
GullSkilt AS
Trondheim

Posts: 1183 | From: Trondheim Norway | Registered: Nov 1998  |  IP: Logged | Report this post to a Moderator
Preston McCall
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What the dickens is FIREGILD?

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Preston McCall
112 Rim Road
Santa Fe, New Mexico
87501
text: 5056607370

Posts: 1552 | From: Santa Fe, New Mexico | Registered: Nov 1998  |  IP: Logged | Report this post to a Moderator
stein Saether
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Member # 430

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Firegild is an amalgan of gold and mercury brushed onto metal and then heated with a flame so that the mercury evaporates and the gold is redused to pure gold chemically bound to the underlaying metal.
A very hazardious and forbidden metod nowadays.

--------------------
Stein Saether
GullSkilt AS
Trondheim

Posts: 1183 | From: Trondheim Norway | Registered: Nov 1998  |  IP: Logged | Report this post to a Moderator
   

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