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Northstar's Dark Cobalt boro is the second most saturated of the four shades of cobalt blue Northstar produces. Dark Cobalt is well suited for thin blown work and cane work. Because of its intensity it must be worked in an oxidizing flame to prevent graying. NOTE; Glass rods are sold by the gram not by the stick please keep this in mind when choosing an amount.
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🇺🇸 Ship from USA · On Agora since 2026
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