Glass, melted at temperatures of 1600 degrees (in the early modern period) and still workable at 700 degrees, is heat resistant. This property made glass vessels suitable for distilling and for separating substances in alchemical processes and in the production of alcohol. Glass vessels did not react with the base materials and, at the same time, allowed to observe the boiling and condensation processes. Glass vessels were thus instrumental for developments in chemistry and pharmacy.

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