Decorative 18th Century Blue-and-White Portuguese Tile Panels: A Type-Case of Environmental Degradation

<table>XRD patterns obtained for irradiated areas in the studied glaze: blue-and-white glaze, white glaze, and green stain. Identified crystalline phases: S—cassiterite (SnO<sub>2</sub>); Q—<i>α</i>-quartz (SiO<sub>2</sub>); Cr—cristobalite (SiO<sub>2</sub>). ?: doubtful identification. The contribution of an amorphous phase is assigned.</table>

Journal of Materials

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Figure 3: Decorative 18th Century Blue-and-White Portuguese Tile Panels: A Type-Case of Environmental Degradation 