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Effective cleaning of rust stained marble

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Figure

Table 1 Solubility products, Ksp, and overall stability constants, logβn, for common cleaning agents
Fig. 1 Cysteine structure. Reduction reaction from cystine to cysteine and second acid dissociation constant of cysteine together with the reduc-tion potential at pH = 7 and the pKa2 value
Table 2 Porosity properties of  the three Carrara Bianco marbles
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
+4

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