Figure 5

San Giacomo Maggiore by Niccolò di Pietro Lamberti ca. 1414. Polished cross section of a sample from a brown area showing the brown discoloration in the bulk of the marble. Visible illumination.

San Giacomo Maggiore by Niccolò di Pietro Lamberti ca. 1414. Polished cross section of a sample from a brown area showing the brown discoloration in the bulk of the marble. Visible illumination.