I agree with Ken!
Try and find out exactly what the dirt is and why it is sticking. Was the
stone polished or waxed in situ? What kind of repair and maintenance
program(s) came before you?
Thanks,
Eric Hammarberg
Vice President
Thornton Tomasetti
51 Madison Avenue
New York, NY 10010
T 917.661.7800 F 917.661.7801
D 917.661.8160
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This message sent from Treo, please pardon spelling and other mistakes.
-----Original Message-----
From: Gabriel Orgrease [mailto:[log in to unmask]]
Sent: Wednesday, May 09, 2007 06:14 AM Eastern Standard Time
To: [log in to unmask]
Subject: Re: [BP] Cleaning Polished Granite
Jayne,
Hi. Good to hear from you.
I do not have any good safe off the top of my head answer.
Is it surface dirt that you are intending to remove? If it were a
granite floor there are several techniques used w/ the two prevalent
being diamond polishing (very fine diamonds) or the use of acidic
cleaners. If you go to the Building Stone Institute their idea of stone
restoration is exactly this practice of cleaning stone floors like in
lobbies of large commercial buildings. They have had some very heated
arguments over these two techniques. You can get this grinding equipment
in hand-held sizes, you can also get hand-rub diamond blocks. Though I
would be very hesitant to use any of it without a great deal of
experiment and investigation on non-sensitive materials. This is the
methodology by which the original polish on the granite was produced...
going from coarse to super-fine mechanically applied abrasives. You may
look to see if there is a stone fabricator near you that you can visit
and learn from their techniques. I have worked on refinishing historic
granite/marble floors before and can assure you that a whole lot of
irreversible damage can be done in the first 2 minutes.
The only other approach that I am aware of would involve figuring out
how to chemically break down the surface dirt... which is what you are
doing with the ProSoCo materials on the other stone surfaces. If it is
not working then you need to go to figure out what it is chemically that
you are trying to remove on a molecular level and from there go with the
chemistry.
][<en
Uhlir wrote:
>Hi All,
>
>I've been skulking around the perimeter of this listserv well over a year
now and
>recognize I'm past due introducing myself.
>
>I'm a project manager in Denver, currently working a corporate ebusiness
contract, which
>could not be a further throw from the wonderful world of stone. Most other
times,
>however, I'm easily found in two of our historic cemeteries.
>
>Over the last few years, I've done monument conservation training with
NCPTT, received
>my cert from Jahn to use their restoration mortars and generally spend my
time teaching
>other volunteers stone assessment practices and cleaning, and doing small
repairs.
>
>We've had success with several products from Prosoco (Biowash & 2010) on
stable but
>soiled marble, limestone, and unpolished granite monuments. However, I
haven't had
>any success cleaning polished granite. Most of the soiling is obvious
black layering which
>is likely carbon based deposits from the many industrial stacks and
railroad/other vehicle
>emissions so prevalent in the area.
>
>Does anyone have thoughts on how to safely clean these polished granite
headstones and
>monuments?
>
>Many thanks,
>Jayne Uhlir
>
>--
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>
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