X-rays and Classical Greek pottery

[gallienus1]

X-rays reveal a chemical map of a Greek vase that shows calcium-based colour additive was used for white, which would have added an additional step. There was also a surprize in that no zinc is present in the black regions. It was considered certain until now that a zinc additive was required to achieving the black figures in the heating process.

See-

http://news.stanford.edu/features/2016/slac/art.html

Steve