Salts are not great for limestone, take that from someone with 26 years experience of stone care along the ocean. Try honing with a 180 or 220 aluminum oxide powder and putting iron out in the water using distilled/purified water. The yellowing is usually caused by with hard water minerials reacting with natural iron in the stone. Let stone dry then seal it well with a solvent based sealer.
Gourmet Stone care
San Diego, Ca.
On Tuesday, December 27, 2016 3:24 PM, stuart rosen <email@example.com> wrote:
A few times each year we get a call from someone that wants to change the color of their stone or terrazzo surfaces.
We have experimented with dye and staining some travetine, saltillo and terracotta with some success.
We have recolored them and then used multiple coats of topical sealers to lock it in.
While clients seemed to like the effects I have always found that stuff odd and never really thought the results were good.
I have never considered doing it on a exterior limestone-while Klenzstone is a great cleaning product it is acidic.
Its possible it may lighten the stone-just be careful around glass as it can etch it.
If you do any testing make sure to charge for your time.
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