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The glazes are G1947U glossy, G2571A matte and GR10-C Ravenscrag Slip talc matte. The clay is H550. The firing schedule is C10RPL. The beauty of cone 10R is that no frits are needed, ordinary mineral mixes melt well. Cone 10 glazes can have high levels of SiO2 and Al2O3, those oxides are what produce durability and hardness. Because these mugs are thin-walled and have an even cross-sections there is no reason they could be not fast fired.
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