[TheForge] sealing copper pee patina

[Peter Hirst]

 So it depends on the use.  Makes sense. The dome on St Matts doesn't have 
any such channels, at least none that are visible from the usual distances, 
and as it happens, my sculpture is all broad surfaces, also without any such 
channels.  So I guess that's what gives both the impression of  permanence. 
So in an application that doesn't get direct wear or concentrated water 
flow, it seems that its the next best thing to permnanent.  maybe 
"perpetual" is a better term.  Hey, nothing lasts forever . . .

Keziah's
----- Original Message ----- 
From: "GRAF" <adveniam at att.net>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Wednesday, February 20, 2008 11:57 AM
Subject: Re: [TheForge] sealing copper pee patina


> Peter,
> The roof top patinas are being constantly replenished as more copper 
> combines with available sulfur.
> If you were to look at any area subject to abrasion from traffic or 
> intense water flow you'd see areas where it is brown. On a roof with wood 
> shingles the spots would be bright red shiny copper.
>
> The copper sulphate is mildly soluble in water and copper roofs eventually 
> dissolve. Valley's and gutters beneath Spanish tile roofs get holes 
> dissolved through them in areas that the watter is channeled.
>
> Peter Hirst wrote:
>> I am not so sure about copper patinas not being permanent.  You se a lot 
>> of copper roofs that stay a nice green indefinitely, (St Matthews 
>> cathedral in DC, for an AMerican example) and I am sure no one is up 
>> there periodically, uuh, renewng the treatment.  I have a commper 
>> sculpture in my shop yard that was treated in this way that has remained 
>> stable for years.   Bears more research, I think.
>>
>>
>> ----- Original Message ----- From: "Woolley" <wjec at verizon.net>
>> To: "Sponsored by ABANA" <theforge at mailman.qth.net>
>> Sent: Wednesday, February 20, 2008 9:00 AM
>> Subject: Re: [TheForge] sealing copper pee patina
>>
>>
>>> lee robbins wrote:
>>>> Thanks for the copper info. i wondered about the
>>>> patina after the cat pee information on steel. I just
>>>> got some tung oil for my tool handles and have a
>>>> memory of someone using it on steel. Will that also
>>>> seal the copper patina more durably than say
>>>> polyurethane  or wax? Just letter openers.
>>>>
>>>> Lee
>>>>
>>>>
>>>>
>>> I use tung oil on steel.  Multiple coats will help but certainly not as 
>>> tough polyurethane.  You can wax a tung oil finish.
>>>
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