A reduction glass made by Double Helix. The glass is COE 104
Iaso (eye-ay-sow) has a high copper content and is capable of yielding bronze metallic exterior lustres. Like Iris, brief but repeated exposure to a small, cool reduction flame produces the best results. The temperature of the beads surface, as well as the intensity, duration, and frequency of reduction determines the final outcome. Variations in the lustre can be accentuated by using a very small oxidizing flame to selectively erase portions of the lustre, then repeating the reduction process.
All tested compatible with Effetre Clear 104 coe.