Figure 8From: Setup of a sustainable indoor cleaning methodology for the sculpted stone surfaces of the Duomo of MilanColorimetric characterization of the pilot areas after different cleaning methodologies. The with dot indicates the application of the reference water cleaning reference; the yellow dot labelled “agar” refers to the agar gel with no additive; in all the other case the name of the additive alone has been reported to indicate the type of gel.Back to article page