Donna:

Martin Weaver, "Conserving Buildings" page198 of the revised edition states:

"Copper may also be attacked by acidic runoff from some lichens and from new
cedar, oak, some pine, and redwood shingles. Certain types of bituminous
materials contain organic acids which will attack copper and leave it etched
a brilliant metallic pink."

Many woods contain organic acids within the extractives portion - that same
portion of the wood which contributes to resistance to fungal and insect
attack

Ken Johnson

----- Original Message -----
From: "Cubberly, Donna R (Donna)" <[log in to unmask]>
To: <[log in to unmask]>
Sent: 30 April, 2001 6:54 AM
Subject: Cedar and Copper


> Can someone direct me to documentation regarding a chemical reaction
between
> cedar and copper, particularly with regard to cedar
facilitating/expediting
> the development of the light green patina on copper?
>
> Thank you.
> Donna R. Cubberly
>
>