“…Concerning the temperature, ancient furnaces were capable of reaching 1100-1200 C. 28,30,[38][39][40] For a given soda-lime-silicate system, increasing the melting temperature promotes the formation of Fe 2+ . [41][42][43] When the melting temperature is low and the amount of alkali is high, ancient glass should be oxidised. On the other hand, a typical Roman glass is partially reduced having a typical blue-green hue.…”
Section: Causes and Effects Of Fe 3+ /Sfe In Glassmentioning
In the 1st–2nd century AD, glass was made black using strongly reducing conditions. Later, the black appearance was obtained adding an excess of colourant rather than controlling the furnace atmosphere.
“…Concerning the temperature, ancient furnaces were capable of reaching 1100-1200 C. 28,30,[38][39][40] For a given soda-lime-silicate system, increasing the melting temperature promotes the formation of Fe 2+ . [41][42][43] When the melting temperature is low and the amount of alkali is high, ancient glass should be oxidised. On the other hand, a typical Roman glass is partially reduced having a typical blue-green hue.…”
Section: Causes and Effects Of Fe 3+ /Sfe In Glassmentioning
In the 1st–2nd century AD, glass was made black using strongly reducing conditions. Later, the black appearance was obtained adding an excess of colourant rather than controlling the furnace atmosphere.
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