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Etching
with high pressure sand remains a very effective way
to introduce variation to a glass surface. Like hydrofluoric
acid, it is often used to remove selected areas of color
in flashed glass (see Acid Etching) or glass previously
painted and fired with vitreous enamel to reveal the
layer beneath.
The use of resists
created with photo sensitive emulsions allows very gentle
gradations when etching with sand. Sandblasting is often
used for carving glass, usually thick float glass. Dramatic
reliefs are possible with this method. Often, selected
areas are acid polished afterwards to create contrasting
textures within a carved piece.
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