Optical Coherence Tomography (OCT), the technique of non-invasive imaging of transparent and semi-transparent sub-surface layers was employed to monitor the state of glazes of historic tiles before and after laser ablation trials. The laser used was Nd:YAG Thunder Art system from LightForArt (El. En. S.p.A.). In this paper, OCT cross-sectional images of both fragments and preserved historic tiles before, during and after laser ablation are shown to examine the process of the removal of surface deposits as well as mid-twentieth century conservation coatings. In case of some of the ceramic fragments (donated to science) the destruction of the glaze layer after a few steps of laser cleaning was induced intentionally and then visualized with OCT. The experiments performed confirmed that OCT is a potential diagnostic tool for the assessment and monitoring of laser removal of deposits from semi-transparent glazes on historic tiles, as well as enabled to define and identify specific risk factors for these objects, such as pre-existing cracks or delaminations within the glaze layer.
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