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...gelatin stain, [[glaze%20stain|glaze stain]], [[iron%20stain|iron stain]], metallic stain, [[oil%20stain|oil stain]], salt stain, [[sap%20stain|sap stain]], [[ File:Staining-01_ICOMOS.jpg|Iron stains; Photo credit: V. Vergès-Belmin

...colors were obtained by grinding away portions of the flashed layer and by staining the abraded areas with silver salts. Examples of early flash glass are foun

* ecomposes in sunlight to form metallic silver and oxygen. * Contact may cause iiritation and staining.