About Cobalt-6, 516

Cobalt 6 is the darkest transparent blue in the Glass Alchemy Cobalt Series — so densely saturated it can appear nearly black in heavier applications while still revealing a deep cobalt blue when pulled to an extremely thin stringer.

One of Glass Alchemy’s earliest and most enduring releases, it was originally developed with millefiori makers and stringer pullers in mind.

An essential borosilicate glass for lampworking artists who need a reliably dark, intensely saturated cobalt blue.

Part of the broader Glass Alchemy cobalt family.

Working Tip: Work in neutral flame to avoid reduction (gray streaks).

Artist Description by Mike Shelbo:

"A stiff, dense translucent cobalt blue, Cobalt-6 is so dense in color saturation that it seems black.

When drawn down into extremely thin threads, it will still remain a deep cobalt blue transparent. Keep Cobalt-6 in the outer region of your flame length, in a mix of gas that will not reduce the color if used without encasement. Grey streaks or patches could develop from too much propane in your torch flame, so using a neutral flame is best.

Cobalt-6 can be sandwiched between clear and blown out very thin while still having an intensely deep cobalt blue color. Light transmitting through Cobalt-6 when color layer is thin enough is very rich and pleasing." - Mike Shelbo