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.  


Bill Selik
Gourmet Stone care
San Diego, Ca. 


On Tuesday, December 27, 2016 3:24 PM, stuart rosen <mail@stoneshine.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.

On Tue, Dec 27, 2016 at 4:51 PM, Ron Moore <rmoore@americanstonecare.com> wrote:

On Tue, December 27, 2016 3:35 pm, Great American Stone Care wrote:
> Hi Partners,
>
>
>
>
> We have a customer that has limestone on the exterior of his home that is
> a yellowish color. He wants it stained or sealed to make the appearance
> any color besides yellow. He said he would be satisfied with it being
> lighter or darker, no preference. Have y'all encountered this situation
> before? Let me know what you think and which direction I can point him in.
>
>
>
>
> Thanks in advance!
>
>
>
>
>
>
> Kindest Regards,
>
>
> Renee Garza
>
>
> Great American Stone Care
>
>
> 281-547-0220
>
>
> www.greatamericanstonecare.com <http://www. greatamericanstonecare.com/>
>
> 212 E Main St
>
>
> Tomball, TX 77375
>
>
>
>
>
>
>
> Visit list archives, subscribe, unsubscribe or change your subscription
> preferences:
> http://stoneandtilepros. simplelists.com/sccpartners
>
>
> Start a new conversation (thread):
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>
> Renee,

Perhaps you could try testing an area with a product called Klenzstone.
This can be found at Regent Stone Products and I believe it comes in
numbers 1, 2 and 3. The Klenzstone #2 is what I think may help. This
product is easy to use, spray the stone with a pump sprayer, allow a few
minutes of dwell time and then rinse. It has a high salt content so use
caution around plants etc. We have used this for exterior cleaning for
years and it works well.

BTW, Love the company name! It's a winner!


Ron Moore, President
American Stone Care, Inc.
16458 Lone Oak Place
Hamilton, VA. 20158
540-338-5559 o
301-602-2307 c
www.americanstonecare.com


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--
Regards,
Stu Rosen
201-446-1200

"EVERYTHING MATTERS"


 
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