Abstract
This report addresses the removal of inorganic encrustations from excavated marble objects. The use of laser radiation was compared with established cleaning methods (micro-air abrasive, ultrasound pick, etc.) and proved to be the most desirable method as it preserves the authentic surface relief. In order to choose the best parameters for laser cleaning, additional tests were performed to compare the effect of ultraviolet and infrared Q-switched pulses. The results were evaluated by means of multi-spectral imaging. It has been proven that such an imaging system can give significant information regarding the cleaning result and therefore highlights the potential for the in situ assessment of the laser cleaning process.
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