I agree with Joyce-here a link to a Klenzstone product that works well.
http://klenztone.com/products/copper-stain-poultice/

On Fri, Oct 13, 2017 at 8:24 AM, <joyce@thepersonaltouchsolution.com> wrote:
You will probably need to poultice the stain with a ferrous and copper stain remover.  The one we have used is made by Prosoco.  You might need multiple applications if it initially lightens.

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-------- Original Message --------
Subject: Copper stains
From: Mike Marsoun <outerislandstonecare@gmail.com>
Date: Thu, October 12, 2017 2:55 pm
To: Stone Care Central Discussion Group
<sccpartners@stoneandtilepros.simplelists.com>

On a job with extensive copper patina staining that has been set in by acid rain....seems similar to an acid stain which does not come out of limestone. I tried my usual go to which works fine if it is surface but it did not budge. Any ideas?


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Regards,
Stu Rosen
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