Found these shipwreck artifacts in a thrift store...

Those salt-glazed pieces were the disposables of their day as far as I know.

Don't ask me where I got it; it's been in common use for a long time, but probably not accepted as standard English. On this side of the Pond it just means "lots and lots".

 

i think i recognize one,the second rown from the right,it looks like the piece of ming dynasty shard,it could be date around 16-17th century,imho

 

I don't see any sediment residue and the glaze and surface shows no signs that this could be from a shipwreck. the polychrome shard and the 2 other shards on the left made of faience. there is no change that you can find a piece of pottery in a shipwreck of a similar condition. IMO

 

https://archaeologynewsnetwork.blogspot.com/2010/10/lewes-shipwreck-site-window-into-1770s.html?m=1

 

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 porcelain can be damaged via physical and chemical transformation.

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 caused by long-term marine deterioration, such as seawater corrosion, mineral sedimentation, marine bio-fouling and marine microbial degradation

Source: https://link.springer.com/article/10.1186/s40494-019-0328-0.


Earthenware is much more poreuser than porcelain and more vulnerable for the elements.
This is why i said there is no change you can find a shipwreck shardes with an unaffected glaze surface without any calsification, seewater corrosion and so on .....