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Today Mexico is well known for affordable, rustic handblown drinking glasses, many of them characterized by a cobalt blue band at the rim. To create different colors, various metal oxides are added. Small amounts of iron and sulfur will achieve amber and brown effects while green and aqua glasses require iron. Light blues need copper, while dark blues contain very small quantities of cobalt. Pastel colors can also be achieved by adding crushed glass of the desired color.
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