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Subject: Cleaning stone

Cleaning stone

From: Shelley Sass <sks3>
Date: Saturday, September 22, 2001
Tony Sigel <asigel [at] fas__harvard__edu> writes

>What, exactly, is the "JOS" system?

The JOS system uses a wet low-pressure rotating vortex process with
micro-abrasives (such as dolomite powder) to clean in architectural
settings.  It has been used extensively to clean stone in Europe and
is being used in North America.  It has been useful for cleaning
stone when other means have been ineffective. The air pressure can
be quite low, (0.1 - 21 psi) and may be used with low quantities
of water. See <URL:> for information about
the equipment available in North America.

Shelley Sass
Architectural Conservator
Yonkers NY

                  Conservation DistList Instance 15:26
               Distributed: Wednesday, September 26, 2001
                       Message Id: cdl-15-26-003
Received on Saturday, 22 September, 2001

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