Notes
Certain colors may employ controlled quantities of calcium or barium compounds as modifiers.
Color Range
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Dark mazarine blue through royal blue to matte blue. Generally darker and more violent in shade than zircon-vandium blues.
Specific Gravity: 3.5-4.5
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Stability/Kiln Atmosphere
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Excellent in most types of glazes and bodies for firing in oxidizing or a slightly reducing atmosphere at temperatures over 1450C.
Compatibility
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Suitable for blending with most other types of ceramic colors including zircon-vanadium blues.
Since these stains tend to be refractory, crawling of overlying glaze can sometimes happen where a 'dry' underglaze lacking sufficient flux prevents the glaze from gaining a foothold on the body underneath.
Cost
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Cost is low to moderate, increasing as the cobalt content increases.
Note: This description is taken from information provided by Blythe Matthey and may or may not apply to stains of this family from other companies.
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