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An amendment to this paper has been published and can be accessed via a link at the top of the paper.Automatic remote reflectance spectral imaging of large painted areas in high resolution, from distances of tens of meters, has made the imaging of entire architectural interior feasible. However, it has significantly increased the volume of data. Here we present a machine learning based method to automatically detect 'hidden' writings and map material variations. Clustering of reflectance spectra allowed materials at inaccessible height