Soda-lime glassrod produced by Double Helix, Ossa is the first in our new speckled color family.
Ossa is a rich purple lustering glass with thousands of refractive inclusions dispersed throughout each rod.
When exposed on the surface, Ossa can be left as a purple speckled glass, or it can be reduced to develop a variety of luster effects. Using variations in flame chemistry, Ossa can produce a solid silver metallic layer, or a multicolored iridescence. When reduced and encased, the inclusions in Ossa produce a textured mother-of-pearl effect reminiscent of some dichroic coatings.

Double Helix glass is compatible with all Effetre, Vetrofond and Precision 104 colours.
Glass for flamework: beads and spun glass.

Coefficient of expansion (COE) 104
Annealing temperature: 470°C (878°F)