Figure 7From: Brownish alterations on the marble statues in the church of Orsanmichele in Florence: what is their origin? Sant’Eligio . Non-discolored area (a). Polished cross section of a sample from this area. The image shows a thin brown crust on the surface while the marble appears white. Visible illumination (b). No strong fluorescence detected. UV illumination (c).Back to article page