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Glasses and ceramics

This category also correspond to the more classical term of “fire arts”. It includes glass (colored or not), stained-glass, porcelains, ceramics, terracotta, but also siliceous materials that have not necessarily been thermally manufactured by man (flint, obsidian and mosaics).


A determination of the siliceous matrix and trace elements


The main goal of the analysis conducted at CARAA on such is to understand the siliceous matrix itself, its state of conservation as well as fillers, charges and flux that may have been added by man.

A composition, a signature


The identification of specific pigments in the case of colored siliceous objects or the characterization of distinctive mineral fillers can help to correlate the item with historical periods and therefore to indirectly date the period at which these pigments were added.

Understanding the alteration phenomena


The characterization of the alteration products in/on siliceous material allows for proper restoration protocol taking into account the harsh environments to which the item was submitted. The common alteration products on stained-glass are potassium, sodium or magnesium carbonates, phosphates and sulfates (e.g. syngenite -K2Ca(SO4)2.H2O-).





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  • Stained-glass fragment from the Sainte Chapelle, Paris (17<sup>th</sup> c.).
  • Stained-glass fragment from the Sainte Chapelle, Paris (17<sup>th</sup> c.).
  • Stained-glass fragment from the Sainte Chapelle, Paris (17<sup>th</sup> c.).
  • Stained-glass fragment from the Sainte Chapelle, Paris (17<sup>th</sup> c.).
  • Small roman glass vase and surface alteration.
  • 18<sup>th</sup> century enamel analyzed prior to restoration.
  • 13<sup>th</sup> century stained-glass fragment (Le Mans) showing different kind of alteration.
  • 13<sup>th</sup> century stained-glass fragment (Le Mans) showing different kind of alteration.
  • 13<sup>th</sup> century stained-glass fragment (Le Mans) showing different kind of alteration.
  • 19<sup>th</sup> century Chinese enamel. Technical study (Priv. Coll.).
  • Early 20<sup>th</sup> century polychrome porcelain. (Priv. Coll.).
  • Stained-glass cross section showing the pigment at the surface of the glass (electronic microscopy).
  • Small uranium-based glass vases, early 20<sup>th</sup> century. (Private coll.)
  • Glass cup uranium (uranium-based), early 20<sup>th</sup> century. (Private coll.)




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