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How did Venetian glassmakers create crackled ice glass surfaces?

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fish of core-made glass — glassware Fish of core-made glass with “combed” decoration, Egyptian, New Kingdom, 18th dynasty (c. 1363–46 bc). In the British Museum. 0.141 m × .069 m.

Venetian glassmakers created crackled ice glass—a decorative surface texture—by dipping a hot glass vessel into water or rolling it across a bed of glass fragments. This technique, which gives the glass a fractured or "iced" appearance, was one of several specialized decorative methods developed alongside others like latticinio and mold blowing.1