Partes praecipuae vitreae coloratae purgantur quartz arenae et potassae feldspar, albitae, plumbi oxydi (prima pars vitri), salnitrum (nitrate potassium: KNO3; refrigeratio), metalla alcali, metalla terrae alcalina (magnesium chloridum: MgCl, auxilium liquescens. , vetustatem augens), aluminium oxid...
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