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Heritage Science
Fig. 3 | Heritage Science

Fig. 3

From: Effective cleaning of copper stained calcareous stone

Fig. 3

Cleaning of a sandstone plinth. Result of cleaning experiments on a sandstone plinth (90 × 70 cm). a Before cleaning. b With the applied poultice. The top row contains a CMC mixing ratio of 5 %, and bottom 1 %. The concentrations of ethylenediamine is from left to right 0.1, 0.05, and 0.01 M, respectively. c After cleaning

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