What a fascinating thought
By the way the link is here:
and on that link after the analysis was done ...it says...
"Whilst the spectra do not show explicitly that the surface is vitrified, the layer does have the composition, sheen, hardness and glassy texture of a glaze. It is very likely that the glaze was made from a ceramic paste applied to the limestone surface."
Edited by seeder, 11 March 2013 - 08:02 PM.