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<p>[QUOTE=&quot;Rec, post: 2854906, member: 6899&quot;]underwater ceramics are generally saturated with soluble salts, mainly NaCl, which were deposited in the porous structure. The repeated crystallization of residual salts through the porous structure of ceramics due to changes in temperature and relative humidity would lead to body cracks and glaze flake off, which would accelerate the degradation. Thus, the body of the <b>porcelain</b> can be damaged via physical and chemical transformation.</p><p><br /></p><p>Given the underwater conditions where these materials have been deposited, and its proximity with other materials and marine organisms, they can present fragility and a concretionary surface. Other scholars have previously determined that the surfaces of marine contexts are usually covered with insoluble salts, such as calcium carbonate, calcium sulfate and ferrous compounds, as well as corals and shells. These deposits and crusts on porcelain are <b>caused by long-term marine deterioration, such as seawater corrosion, mineral sedimentation, marine bio-fouling and marine microbial degradation</b></p><p><br /></p><p>Source: <a href="https://link.springer.com/article/10.1186/s40494-019-0328-0" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://link.springer.com/article/10.1186/s40494-019-0328-0" rel="nofollow">https://link.springer.com/article/10.1186/s40494-019-0328-0</a>.</p><p><font size="4"><br /></font></p><p><font size="4"><br /></font></p><p><font size="4">Earthenware is much more poreuser than porcelain and more vulnerable for the elements. </font></p><p><font size="4">This is why i said there is no change you can find a shipwreck shardes with an unaffected glaze surface without any calsification,&nbsp; seewater corrosion and so on .....</font>[/QUOTE]</p><p><br /></p>

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