- ishigh-fired,vitrifiedandnonporous.Becausestonewareisnonporous,glazeisappliedonlyfordecoration.Thesenonporoussurfacespaintbadlywithabrush.Asiliconizednonporouslayeroncopperalloymaybeobtainedbyefficientsiliconizinginpowdermixtures.Allinteriorwalls,flo...
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