The reheating of an article at the furnace aperture during manufacture to restore its plastic condition; esp., the reheating of a globe of crown glass to allow it to assume a flat shape as it is rotated.

A mode of covering transparent white glass with a film of colored glass.

Heating the glass briefly in the glory hole, it evens out the temperature of the working glass, including the punty, when working mostly on the rim, reheating at the door. Also part of the decorating technique of striking where the air is blocked (or gas added) in the gloryhole before flashing, producing a flaring yellow reducing flame that pulls oxygen from the metal oxide decorations, leaving shiny metal at the surface.

applying a thin layer of glass to the body of a glass object by dipping the piece into molten glass of a different color; this outer layer can be cut or scratched through to reveal the body color underneath.

A form of decoration popular on various types of Victorian glass wherein a glass piece of one color is, while still very hot, dipped into molten glass of another color to form a very thin outer layer. Quite often this thin outer layer was then engraved with a naturalistic design cut through to the base. A similar effect could be obtained by applying a colored stain (often in ruby red or amber) and this staining was especially popular on late 19th century pattern glass whereas flashing was reserved for generally more expensive lines of glassware.

The application of a very thin layer of glass of one color over a layer of contrasting color. This is achieved by dipping a gather of hot glass into a crucible containing hot glass of the second color. The upper layer may be too thin to be worked in relief. "Flashing" is sometimes used (erroneously) as a synonym for casing.

a method of coloring glass by dipping it in a batch of colored glass. IGCB

Dipping a blown shape of glass into molten glass of a contrasting color

Quickly placing the working glass into the Glory Hole to reheat the entire piece to assure that the glass will be pliable and keeping it safe from cracking.

Very thin layer of colored glass fired or vaporized on base glass.