About Cobalt-4, 514

Cobalt 4 is a rich transparent cobalt blue borosilicate glass developed as an ideal density for small blown work and classic surface applications.

Dark enough to deliver strong cobalt saturation while still allowing light transmission in thinner applications, it performs especially well when blown thin or worked entirely on the surface.

A favorite for encasing, cane pulling, and layering techniques, Cobalt 4 adds depth and subtle blue tinting without overpowering underlying colors.

Work in a neutral flame to avoid reduction and unwanted gray streaking.

Part of the broader Glass Alchemy cobalt family.

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

Artist Description by Mike Shelbo:

"Cobalt-4 is a choice color for applications that will be blown out thin or when the color is all on the surface.

This color is still light enough to see through when the thickness of color is 8mm or less. Over reduction with heavy propane flame will leave minor grey streaks but working with a neutral flame will prevent this from happening.

This is a great color to encase other colors with and pull into smaller cane. Try encasing Paparazzi with this color and pull stringers out for a nice subtle tint. Use this technique over opaques and Crayon colors for a variety of new possibilities." - Mike Shelbo