John ‘s steps are perfectly said and he is right about the granite mixed with some calcium. This would show as etching, but pure granites also do etch
With hydrofluoric chloride or toilet cleaner
And as well I had a case when a carpet man put his soaked rag on the counter and the pure Canadian green granite turned white like as if all the colors had been washed out.
Maybe Dr Fred will have a moment to identify what product in the carpet cleaning business can cause such a reaction.
Ciao
From: John Freitag [mailto:jfreitag@thestoneandtileschool.com]
Sent: February-27-09 12:59 PM
To: Restoration and Maintenance
Subject: RE: [sccpartners] Etched Granite
Don,
Regarding the granite etching you have on the countertop, it can be repaired but use caution. You will need to diamond hone these areas be sure to feather out each grit so you do not dip the stone.
I would recommend honing up to at least a 3000 hone, then use a black or dark colored granite powder. This will bring back to color along with the shine.
You may see once you have completed the job your repair looks better than the rest of the counter. this means you should sell repolish and sealing all the counters.
The reason this granite etched is that many of the granite that are now coming into the market has calcium in it and the calcium that in the stone is actually etching.
If I can be of any additional help please call.
Best regard
John Freitag
The stone and Tile school
From: supersem i@gmail.com [mailto:supersemi@gmail.com] On Behalf Of Don Semi
Sent: Thursday, February 26, 2009 8:44 AM
To: Restoration and Maintenance
Subject: [sccpartners] Etched Granite
Good Morning All:
Attached are the pics relating to sulfuric acid on granite. Granite appears to be 2cm Verde Butterfly. My concerns are as follows: In anyone has experience with this issue, how deep does the damage go? Is it similar to marble etching or are there different factors that I am not aware of when it comes to granite being etched. I am capable of face polishing the area but with this type of problem is it better to just walk.
Looking forward to feedback. Thanks
--
Sincerely:
Don Semi
Stone Restoration Services - Denver
Dedicated to the Preservation of Fine Surfaces
don@srsdenver.com
303-249-7909
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