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Carnival glass, an inexpensive rainbow-colored glass was first created around 1904 in the United
States before spreading to other countries. The glass is formed by
combining metal oxides while the glass is molten, pouring it into molds
and spraying metallic salt solutions onto the hot surface before firing
it again. The melting of the salts creates the rainbow colors (Newton's
rings) of varying density and light refraction. Hand decoration
augments the iridescence and pearlescence that is popular with
collectors, and inspires hairstylists who are experienced in adding
highlights to
their clients' tresses. Much more attractive and glowing than mere glass painting.
The formula was a response to Louis Tiffany's more expensive and elegant
glass creations, with the result that the pieces became a "poor man's
Tiffany". The inexpensive metal-oxide technique, when applied to
inexpensive machine-made molds, compared with Tiffany's far more
expensive hand-blown creations.

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