No. A ceramic item cannot be altered after firing without applying considerable external forces.

This is a vent hole and thus relates to the production process. Behind this hole is a cavity from which the air has to escape during the firing process.

High mechanical strength, unchanging material, non-ageing, glass-hard sealed surface.
UV-resistant, heat- and cold-resistant, colourfast, corrosion-proof, resistant to fire and burning cigarettes, abrasion- and scratch-proof (EXCEPTION: Wondergliss), dimensionally stable, odourless, tasteless.