How did Rhenish glassmakers decorate glass with serpentine trails?

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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.

Rhenish glassmakers decorated glass with serpentine trails—a style known as Schlangenfadengläser—by trailing threads of glass onto the vessel, which were then pressed flat and notched to create the characteristic serpentine patterns. This decorative technique was a specialty of the Rhineland region during the 3rd and 4th centuries.1