• “Bull’s eye” — a glass pane with a pontil mark surrounded by concentric ridges. This was the central part of a large pane of crown glass. In the 19th century used as a decorative element.

    Bull’s eye
  • Cabinet stained glass (Germ. Kabinettscheibe) is a term that became firmly established in Russian literature on glass panels of the 16th-19th centuries. The name “cabinet” comes from so-called art cabinets (Germ. Kunstkabinett) which were popular in the 16th century and besides paintings and sculptures included small-format glass panels. However, internationally this term is not used and is considered outdated.

    Cabinet stained glass
  • Cold glass painting – painting with gouache, oil and tempera paints which does not need to be treated with heat.

  • Cords — vitreous inhomogeneous oblong glass fibers formed during the boiling process, located either on the surface or within the glass and often accompanied by air bubbles.

  • Enamel — vitreous substance made of finely powdered glass colored with metallic oxide and suspended in an oily medium for ease of application with a brush. The medium burns away during firing in a low-temperature muffle kiln (about 965–1300 °F or 500–700 °C). Sometimes, several firings are required to fuse the different colors of an elaborately enameled object.

  • Glass panel (Germ. – Kleinscheiben) is a small-format stained glass, very popular in the period between the end of the 15th – beginning of the 17th centuries. A small painted glass panel usually made for private commissioners and meant to be looked at up close.

  • Glass tinted in bulk — coloured glass, tinted during boiling by adding dyes and various metal oxides

  • Grissaille — (from French gris, “gray”) a method of decorative painting in monochrome gray especially, but not exclusively, on stained glass windows. The iron-based pigment varies in colour from light gray to dark brown.

  • Hot glass painting – painting with schwarzlot, enamel, grisaille and other materials followed by firing.

  • Lead binder (cames) — a flexible lead tape with a profile that holds the glass fragments together.

  • Mastic — a special paste-like putty, which is used to attach glass fragments to the lead cames more tightly.

  • Silver stain — a yellow stain based on silver nitrate or similar compounds, which is fired it at a relatively low temperature. The intensity of the colour depends on the concentration of silver and the firing temperature. Silver stain, as well as enamel, is applied on the reverse (“street”) side of the glass.

  • Schwarzlot — (German, “black lead”) A sepia enamel first used in painting stained glass and later applied to glass vessels, either by itself or in combination with other enamels or gold.

  • Stained glass – the term refers to window décor meant primarily for religious and sometimes secular architecture. This glass art is made in a special technique that includes binding together coloured and painted fragments of glass.