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GlazyGirl

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As Min indicates, Kona F4, a soda spar that is now obsolete and unavailable, is reasonably close to Minspar200 and can be substituted with little or no change in the fired glaze. However,  just for clarification, back in the day Kona also produced a potash spar labeled A3. Check your recipe and confirm that it was F4 or A3. 

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