This item was found unlabeled and appears to be Glass Alchemy's Indigo Luster

Middle Shelf Quality 20 Inch Colored Borosilicate Rod by Glass Alchemy. All colors are shown after being flame worked. This Indigo Luster rod is approximately 7mm in Diameter.

1lb bundles

Properties: Deep Color Saturation, Opaque, Stiff

Working characteristics: Prefers neutral flame