1. Significant products have not been allowed to meet a net addition of mud and debris in the residual slag blank glaze caused by the defects, non-significant deficiencies to meet not more than 1.0 mm2.
2. Edge products or partial allowed fly ash as a result of the flames caused by the rough surface of tawny.
3. Products was not met due to the thin layer of enamel formation of a local phenomenon glazed not bright
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