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Subject: Removing permanent marker from porous stone

Removing permanent marker from porous stone

From: Olaf Pung <pung<-a>
Date: Wednesday, June 15, 2011
I am cleaning a stone sculpture (volcanic tuff) with tags written on
with different permanent markers--solvents only worked with "paint
markers", for the black and red writings I also tried hydrogen
peroxide, without effort. Is it possible to bleach it, e.g. with
sodium hypochlorite, or is the ink pigmented?

Olaf Pung
Conservation of stone objects
Thuer, Germany

                  Conservation DistList Instance 25:3
                   Distributed: Sunday, June 19, 2011
                        Message Id: cdl-25-3-019
Received on Wednesday, 15 June, 2011

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