Bump


On 04/05/2025 13:07, David Paste wrote:

Hello,

I know that copper roofing goes green with verdigris, and I'm assuming
that it's the same substance that appeared on some wiring in my old car,
but is this actially corrosion, or just like an oxide coating similar to
the way aluminium oxidises and forms a protective cover? Do verdigris
roofs need replacing every so often?

I am really not good with chemistry, so please forgive the next question
if it is stupid.

I saw a video recently (I think it was that Ed fella who makes odd cars)
who dunked the ends of some green copper auto-wiring into a solution of vinegar and salt to clean the wires back to a useable state.

My question is what does the salt do? Would it not be the vinegar that
is doing the work of cleaning the copper? I have read conflicting
reports on the web which have left me uninformed, if not worse.

Any education gratefully received!

Thanks.

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On 06/05/2025 12:48, David Paste wrote:

Bump

On 04/05/2025 13:07, David Paste wrote:

Hello,

I know that copper roofing goes green with verdigris, and I'm assuming
that it's the same substance that appeared on some wiring in my old
car, but is this actially corrosion, or just like an oxide coating
similar to the way aluminium oxidises and forms a protective cover? Do
verdigris roofs need replacing every so often?

Oces and other metallic salts ARE corriosion dear,

I am really not good with chemistry, so please forgive the next
question if it is stupid.

I saw a video recently (I think it was that Ed fella who makes odd
cars) who dunked the ends of some green copper auto-wiring into a
solution of vinegar and salt to clean the wires back to a useable state.

yes, that sometimes works

My question is what does the salt do? Would it not be the vinegar that
is doing the work of cleaning the copper? I have read conflicting
reports on the web which have left me uninformed, if not worse.

Well the vinegar is probably turning copper hydroxide (non soluble) into
copper acetate, which is. Salt speeds up the reaction.

Any education gratefully received!

Thanks.

--
There is something fascinating about science. One gets such wholesale
returns of conjecture out of such a trifling investment of fact.

Mark Twain

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On 06/05/2025 20:45, David Paste wrote:

On 06/05/2025 13:43, The Natural Philosopher wrote:

Oces and other metallic salts ARE corriosion dear,

Thanks love. May I ask what "Oces" is/are?

Well the vinegar is probably turning copper hydroxide (non soluble)
into copper acetate, which is. Salt speeds up the reaction.

Thank you very much! What would be a realistic lifetime of a copper roof then? (just curious)

Dunno, but The Statue of Liberty is still standing.


--
Regards
wasbit

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On 07/05/2025 10:35, wasbit wrote:

On 06/05/2025 20:45, David Paste wrote:

On 06/05/2025 13:43, The Natural Philosopher wrote:

Oces and other metallic salts ARE corriosion dear,

Thanks love. May I ask what "Oces" is/are?

Well the vinegar is probably turning copper hydroxide (non soluble)
into copper acetate, which is. Salt speeds up the reaction.

Thank you very much! What would be a realistic lifetime of a copper
roof then? (just curious)

Dunno, but The Statue of Liberty is still standing.

Ultimately the corrosion layer protects the roof.

--
Microsoft : the best reason to go to Linux that ever existed.

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On 07/05/2025 10:35, wasbit wrote:

On 06/05/2025 20:45, David Paste wrote:

On 06/05/2025 13:43, The Natural Philosopher wrote:

Oces and other metallic salts ARE corriosion dear,

Thanks love. May I ask what "Oces" is/are?

Well the vinegar is probably turning copper hydroxide (non soluble)
into copper acetate, which is. Salt speeds up the reaction.

Thank you very much! What would be a realistic lifetime of a copper
roof then? (just curious)

Dunno, but The Statue of Liberty is still standing.

But not what it stood for.

"Give me your tired, your poor, etc."

--
Sam Plusnet

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David Paste <pastedavid@gmail.com> wrote:

Thank you very much! What would be a realistic lifetime of a copper roof then? (just curious)

Properly specified, and with adequate green patination, centuries.


--
braind

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