Calcium Oxalate:A Surface Treatment for Limestone
Tody M. Cezar
Figure 3: Portland stones (left) the control and (right) treated with a 5% solution of ammonium oxalate in paper pulp poultice paste for five hours.
Copyright © Tody M. Cezar, 1998. All rights reserved.
http://www.ucl.ac.uk/archaeology/conservation/jcms/
jcms@ucl.ac.uk