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Heritage Science
Fig. 2 | Heritage Science

Fig. 2

From: Effective cleaning of rust stained marble

Fig. 2

Cleaning in solution. Result of cleaning experiments from immersion of samples (4 × 2 cm) of artificially discoloured La Piana Carrara marble in 0.1 M solutions of a cys, b cys + SD, c cys + (NH4)2CO3, d cys + SD + (NH4)2CO3. The artificially discoloured marble piece (10 × 4 cm) before cutting into smaller parts is shown at the top of the figure

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