Wow!  Thanks Ken.  I guess I overlooked that one.  Any research cited?

-jc

Ken Johnson wrote:

> 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
> >
> >