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

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the batch in order to facilitate the fusing of the silica.
Fluxes are also added to enamels in order to lower their
fusion point to below that of the glass body to which
they are to be applied. Potash and soda are fluxes.
Folded rim: A rim that has been folded to double its
thickness and thereby increase its strength.
Fondo d’oro (italian, “base of gold”): See Gold glass.
Font: The reservoir for oil in a lamp.
Foot: The base of an object; the part on which it rests.
See also Roman foot.
Foot-ring: A separate ring of glass added to the base
after the body of the vessel has been formed.
Forest glass beaker.
Germany, 15th–16th
century. H. 7.8 cm.
Forest glass: Glass made in the
rural glasshouses of central and
northern Europe in the late Middle
Ages and the early modern period.
Most forest glass was fluxed with
potash derived from the wood
with which the furnaces were
fueled. it is green because of iron
impurities in the sand from which
it was made. The German term for
forest glass is Waldglas.
Forgery: A copy or imitation of an
object, made with the intention of
deceiving prospective owners into
believing that it is the genuine article.
Former mold: A mold with the same shape as the desired
object, usually a vessel. Flat glass blanks are made
into vessels by sagging them over or into former molds.
Founding: The initial phase of melting batch. For many
modern glasses, the materials must be heated to a tem-