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

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Inclusions: A collective term for bubbles, metal and
glass particles, and other foreign materials that have
been added to the glass for decorative effects.
Inlay: Any object embedded in the surface of a larger
object. See also Marquetry.
Intaglio (from italian, “engraving”): A method of wheel
engraving whereby the ornamentation is cut into the
object and lies below the surface plane. The German
name for this technique is Tiefschnitt.
Intarsia (from italian intarsio, “marquetry”): A type of
glass developed by Frederick Carder (1863–1963) about
1920. A design of colored glass was applied to a parison
of a different color, then flashed with a second parison
of the same color as the first.
Intercalaire (French, “inserted”): The process of applying
two layers of decoration, the first being covered with a
skin of glass that serves as the surface for the
second.
Iridescent vase. U.S., Tiffany Studios,
about 1912. H. 47.6 cm.
Iridescence: The rainbowlike effect
that changes according to the
angle from which it is viewed or the
angle of incidence of the source of light. on
ancient glass, iridescence is caused by interference
effects of light reflected from several
layers of weathering products. on certain
19th- and 20th-century glasses, iridescence
is a deliberate effect achieved by
the introduction of metallic substances