[MassHistPres] cleaning gravestones

[Leo Greene]

Fannin-Lehner has been using D2 for years with great success. the way
marble monuments clean up can be particularly striking.
D2 works passively and there's a process for a more active cleaning using
the product. I have found that if you spray a stone down with it and wait
15 or 20 minutes and then give it a good scrubbing with H2O you remove a
lot of the surface biological growth. At that point you give it another
spray of D2 and wait several days for the product to work passively. Repeat
as needed.
There certainly have been some marbles which have not entirely cleaned up
with D2 but they are the exception and not the norm. The slates I have
found much easier to clean in general (less porous).
One word of caution: after spraying with D2 some marbles turn a bright
orange color. While this can be alarming it is temporary.  We aren't
exactly sure why some do this but we suspect it's the reaction of certain
minerals or certain biological growth to the chemicals in the D2.
I recommend the product.

Leo Greene
Fannin-Lehner Preservation Consultants

On Tue, Feb 12, 2019, 2:14 PM Barbara Search <basearch945 at gmail.com wrote:

> It has been suggested to the Sturbridge Hstorical Commission to use D2 to
> clean gravestones in the Old Burial Ground. Does anyone have experience
> with this biological chemical?
>
> Barbara A.Search
> Chair, Sturbridge Historical Commission
> 508-347-6488
> _______________________________________________
> MassHistPres mailing list
> MassHistPres at cs.umb.edu
> http://mailman.cs.umb.edu/listinfo/masshistpres
>
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