Lead glass is a variety of glass in which lead replaces the calcium content of typical potash glasses. Lead glass contains typically 18–35 mol% lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. Lead glass is desirable due to its decorative properties. Technically, the term crystal is not applied to glass, as glass, by definition, lacks a crystalline structure. The use of the term lead crystal remains popular for historical and commercial reasons; originally stemming from the Venetian use of the word cristallo to describe the rock crystal imitated by Murano glassmakers. This is a naming convention which has been maintained to the present day to describe decorative hollow-ware.

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