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How was vetro di trina made with a lacy white pattern?

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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.

Vetro di trina (Italian for "lace glass") is a sophisticated form of latticinio glassware characterized by a delicate, lacy white pattern embedded within clear glass.12

The technique involves the following process:

Preparation: Opaque white glass threads are twisted into cables and incorporated into a matrix of clear glass.2
Layering: To achieve the signature lacy effect, a glassblower first prepares a bulb of glass decorated with these cables or threads running obliquely in one direction.2
Assembly: This bulb is then blown inside a second bulb of glass that contains threads twisted in the opposite direction.2
Final Shaping: The resulting composite globe, which features the intersecting threads, is then worked into the desired vessel shape.2

This method creates a complex, netted appearance that covers the entire surface of the glass.12