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Growth of Bent Glass During the Dark Ages

During the Dark Ages, better raw materials were used and more efficient furnaces were built for the creation of bent glass, shedding light on the Dark Ages. Ash from plants and trees created a superior flux (material that enables glass to melt at lower temperatures). This ash was made up of high concentrations of potassium oxide, which replaced the sodium oxide previously used in glass-making techniques. Wood fuel for furnaces meant that glassworks were usually situated in forest areas away from towns. Meanwhile, the Chinese started to make bent glass and other objects in the 5th century CE.

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