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Glass with Potash–Lime–Silica (PLS) composition was typically produced for the cathedral windows during the Middle Age in Central and Northern Europe and is known to be very sensitive to the attack of the atmospheric pollutants. PLS glass, containing different amounts of K 2 O (sample V1=15wt%, V2=20wt%, V3=25wt%), was produced and aged in concentrated boiling H 2 SO 4 and...
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