re info on old bottle for M.Cotton

Hello Michael,
in my opinion the thick encrusted layer should not be removed. This is just
the deformation of the glass, so called irrisation, this occurs on bottles
that have been burried in the ground or have been exposed to sea water. The
glass is affected because of a chemical reaction between the salty sea water
and the minerals in the glass. The irrisation gives the bottle something
extra and also has a historic value. It is quite common that this irrisation
will (can) flake off. You will have to handle the bottle with extreme care
and do not expose it to severe temperature changes.

All the best,
MaNu