Abstract
Reflectance spectroscopy is a non-invasive method that is based on the fact that a specificobject/material provides various reflectances in different wavelengths across the spectral range. Itcan provide unique information regarding the material composition of the object of interest and hasbeen used in many fields in recent years. Determining composition of historical plaster is veryimportant when defining its individual components and possibly place of origin or even its age. Thisinformation can be a key issue for its future repairs that are desired to be done as similar to theoriginal method as possible.For a precise reflectance spectroscopy material detection, a fine spectral library is needed.Special mathematical methods are used for comparison of measured spectral curve with individualspectral curves stored in the used spectral library. The spectral analysis then shows similarity ofthe measured curve with the reference ones.This paper introduces results of the new plaster composition spectral library created byDepartment of Geomatics, Faculty of Civil Engineering, Czech Technical University in Praguewithin the Czech Ministry of Culture Project (DF13P01OVV002). This spectral library has beentested on two historical plaster samples.
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