Fig. 3From: Effective cleaning of rust stained marbleCleaning with poultice. Result of cleaning experiment with two different poultices on the three different types of Carrara marble. a Fabricotti, b Vaglia, c La Piana. Top polutice with cys + SD + (NH4)2CO3. Bottom poultice with cys + SD only. Concentration of each chemical 0.1 M. The middle fields show the uncleaned area. Sample size 10 × 4 cmBack to article page