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| Galena |
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Mineral pigment used as eye cosmetic. |
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| Gilding |
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The process of decorating glass by the
use of gold leaf, gold paint, or gold dust. The gilding
may be applied with size, or amalgamated with mercury.
It is then usually fixed to the glass by heat. Gold leaf
may be picked up on a gather of hot glass. Gilding can
be applied in hot or cold techniques. In hot gilding,
gold chloride is dissolved in boiling distilled water,
an amalgam of gold and mercury can also be used. In cold
gilding gold it is fixed with flaxseed oil. |
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| Glass |
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(Si O2) (Ca) (Na)
An amorphous, artificial, non-crystalline substance made
by fusing some form of silica and an alkali and sometimes
another base such as lime.
Material obtained by the overcooling of an homogeneous,
massive, fused substance formed by silica, lime and soda.
When hot it is soft, easy to work with, thus, ductile.
It is transparent or translucid and hard, fragile to changes
in temperature. Resistant to most reactive agents.
Chemically speaking, glass, in its purest form, is silicon
anhydride or silica which means that every molecule is
formed by an atom of silicon and two atoms of oxygen.
Silica can be sand, quartz crystals or flint. |
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| Glass Paste |
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Mix of grind glass, flux and metal oxides
fused in a mold. |
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| Glaze |
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Vitreous polish, used for clay or earthen
ware. |
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| Grisaille |
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Decorative painting on glass used since
the Middle Ages to define details and shades in stained
glass windows. |
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