. Glass. t they obtained not only by care in the selection oftheir materials, especially in the source of the silica, butalso by an early mastery of the use of manganese, theglass-makers soap. The Venetian glass excelled againin its working qualities, in the extreme ductility which itmaintained through a wide range of temperature. Thisproperty was in a measure due to the large quantity ofalkali which entered into its composition. On the otherhand, this excess of soda has led at times to a rapidtarnishing of the surface, visible above all in our dampclimate. But it is to the works of the contem
. Glass. t they obtained not only by care in the selection oftheir materials, especially in the source of the silica, butalso by an early mastery of the use of manganese, theglass-makers soap. The Venetian glass excelled againin its working qualities, in the extreme ductility which itmaintained through a wide range of temperature. Thisproperty was in a measure due to the large quantity ofalkali which entered into its composition. On the otherhand, this excess of soda has led at times to a rapidtarnishing of the surface, visible above all in our dampclimate. But it is to the works of the contemporary Italianwriters that we had better turn for information on thesepractical points. These are of two classes :—ist. Worksof some literary pretension which contain chapters on theglass of Murano for the information of the general , Technical treatises, consisting for the most part offormulas for the use of the glass-maker. To the firstclass belong Fioravantis remarks on mirrors, which we214.
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