Notes
Produced from calcined mixtures of tin oxide, lime and chrome oxide in the form of potassium dichromate. Certain colours contain silica and small quantities of other compounds as modifiers.
Color Range
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Pale pink through crimson to maroon and lilac shades. Most chrome-tin based colours are bluish in comparison with manganese and iron-based colours.
Specific Gravity: 3.75 to 4.75
Stability/Kiln Atmosphere
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Excellent for firing in an oxidising atmosphere at temperatures up to 1250C.
Overfiring or firing under reducing conditions causes severe fading. Unstable in the presence of zinc oxide.
Compatibility
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Suitable for blending with most types of zinc-free ceramic colours. The best color development can be had using glazes produced with high calcia frits (e.g. Ferro 3134).
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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Relatively high owing to the relatively high intrinsic cost of tin oxide.
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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