Eglomisé is an extremly delicate technique of applying metallic leaves to the back of the glass. The result is a mirror with a whimsical effect, which is altering as the light falls across it.
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The "Verre eglomisé" technique is named after the XVIIIth century French art-dealer Jean-Baptise Glomy who sold drawings framed by glass borders glinting with gold and whom made popular the technique that dates back to Roman times.