[MassHistPres] cleaning gravestones

[Chris Clawson]

This interests me. It seems the most serious issue is with the marble 
monuments. Marble is easily damaged by acids and other environmental 
factors. Slate's big problem seems to be from the penetration and 
freezing of water, which tends to split the stone apart. Another big 
problem for marble and slate is the idiots with weed whackers and mowers 
which deface the stones through carelessness. Granite seems to be 
impervious to anything and needs little maintenance.

Aside from "D2", a friend of mine uses a product named "Wet and Forget". 
I guess both soak into marble and reverse the black stain and help 
maintain PH. Marble needs to breathe and remain porous. I, for one, am 
interested in hearing more on the topic.

Chris Clawson
Museum of Our Industrial Heritage
http://industrialhistory.org

On 2/12/2019 2:04 PM, Barbara Search 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
>
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