Ancient Glass Blog of The Allaire Collection


Posted in Uncategorized by Allaire Collection of Glass on November 11, 2017

Ribbing of Glass Vessels


The ribbed design on glass vessels is created by having the glass blower blow a bubble into a mold with internal ribs, sometimes called an optic mold. When removed, the ribs can be left with sharp edges or softened by further inflating, leaving the ribs less pronounced or even extremely faint. The blow pipe may also be twisted and the glass further inflated creating a swirled effect on the vessel giving it the desired surface texture.  The final form of the vessel is then completed.

Below are examples from the Allaire collection and other collectors to illustrate ribbing on glass vessels.

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