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| Sandwich Glass |
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Double walled glass with inner decoration
of an engraved or painted metal leaf. |
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| Silica |
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Silicon dioxide (SiO2) Mineral with many
cryptocristalline varieties (quartz, rock crystal, amethyst,
etc.) and amorphous (calcedony, jasper, agate, etc.)
Silica is the most abundant mineral on earth. In ancient
times, earth’s three great divisions were called
by their average chemical composition.
The crust was called SIAL (silica and aluminum); the stratum
was SIMA (silica and magnesium) and the core NIFE (nickel
and iron). When it is added but not consolidated it forms
silica sands but when consolidated forms rocks such as
quartz arenites, when containing other particles of rock
and other minerals; or quartzite when containing only
quartz.
It is found in a great quantity of minerals. It’s
a polymorphic body occurring in nature as quartz or crystal
rock, trydimite. |
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| Soda |
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Soda hydroxide, White, glassy solid material
very soluble in water and alcohol. It is obtained by the
dissolution of sodium chloride by electrolysis. |
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| Soda-Lime
Glass |
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Soda is commonly used as the alkali ingredient
of this type of glass. It is soft and easy to work in
a kiln. |
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| Sodium |
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(Na) Chemical element belonging to the
alkaline family.
It is the sixth most abundant element on the earth’s
crust. Its most important salts are sodium chloride or
common salt, sodium carbonate, cubic niter and sodium
sulfate. It is a white, opaque, soft, ductile and chemically
active metal. |
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| Stained Glass
Window |
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(leaded) Window glass composed of small
panels of dyed and painted glass, held in strips of cast
lead and mounted in a metal framework, used for doors
or windows. |
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| Stained-glass
Window |
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Glass frame for doors and windows made
of pieces of coloured glass fitted into channeled lead
strips. |
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| Staining |
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Silver or yellow Staining; the process
of colouring the surface of annealed glassware by the
use of coloured pigments, ochre and silver chloride that
merely sink into the surface leaving a yellow transparent
film. This technique has been used since the XIV century
mostly for stained-glass windows.
For copper or red staining, a mix of copper sulfate and
ochre is used which, after three distillations by a reducing
agent, produces a red glaze. |
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| Steatite |
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Talc variety made up by phyllosilicates
occurring in grey or green compact or finely scaly masses
which, when mixed with clay and feldspar forms a material
used in ceramics. |
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