Cobalt, a potent coloring oxide, imparts a vibrant blue hue to glazes at all temperatures, turning black in high concentrations. As the most powerful ceramic colorant, it remains stable in most systems, commonly added at 1% or lower. Similar to copper, it exhibits active melting in oxidation. When mixed in a high percentage with a fluid frit base, it crystallizes completely during cooling. While potters have historically used cobalt as a body and slip stain, achieving consistent results without fired specks posed challenges.
- Powerful colorant: Cobalt is the most effective ceramic colorant, providing intense and stable hues at low concentrations (around 1% or lower).
- Stability and application: Widely used in glaze recipes, cobalt brings stability and desired blue color to ceramics with precise dosage control.
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1 bag= .25lbs, 2 bags= .5lbs, 4 bags = 1lb