Glass: A Pocket Dictionary Of Terms Commonly Used - Corning ...

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a heraldic two-headed eagle whose wings bear the insignia
of the Holy roman Empire.
Relief cutting: A type of cut glass with decoration in
high relief, made by removing the background.
Resist: A substance that resists or prevents a particular
action. During the process of acid etching or sandblasting,
parts of the surface are protected with a resist.
Reticello: See Vetro a reticello.
Retort: A vessel with a long neck, bent downward, in
which liquids subjected to distillation are heated.
Retorti, retortoli: See Vetro a retorti.
Reverse foil engraving: A decorative technique in which
gold or silver leaf is applied to the back side of a piece
of glass, engraved, and protected by varnish, metal foil,
or another piece of glass. See also Verre églomisé.
Reverse painting: The term applied to a number of
decorative techniques, all of which involve painting,
on the back side of the glass, a design that is viewed
from the front (that is, through the glass). because of
this, the painter must apply the pigments in the reverse
of the normal order, beginning with the highlights and
ending with the background.
Rhyton (from Greek): A drinking vessel used in many
parts of the ancient world. Most ancient glass rhytons
are of the roman period. They are in the form of a horn,
sometimes with the head of an animal at the tip. The
tip is perforated, and one drank from it by holding the
rhyton above one’s head and catching the stream of
liquid in the mouth.
Ribbed bowl: An ancient roman vessel decorated with
a continuous band of vertical ribs.