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Although this Montana talc (Silverline 303) is white as a raw material (vs. dark grey for the Texas material, Natural Minerals C-98), it does not fire nearly as white (even though their data sheets both claim 0.5% Fe2O3). The Montana material is often suitable as a substitute in glazes where percentages are low. If higher percentages are employed (e.g. 10% to achieve a silky matte) then color will darken if Montana talc is substituted for Texas talc. In bodies, where talc is used as a flux in low percentages (e.g. 1-3%) the color should be OK. In low temperature clay bodies, where talc was employed to adjust thermal expansion, as much as 50% is used - of course in these cases the color will be far too dark.
Materials |
Pioneer 2661 Talc
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Materials |
Silverline 303 Talc
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Materials |
Natural Talc C-98
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