Fig. 13: Corrosion process of bluish-white porcelain and its complex interactions with sponges.

a Before the sponge adheres to the bluish-white porcelain, the artefact surface begins to undergo physical damage and chemical corrosion; b The sponge adheres to the rough surface, and glaze corrosion continues; c The sponge remains continue to protect the artefact surface after its death, while glaze corrosion continues; d Corrosion morphology of the surface of bluish-white porcelain after sponge peeling.