On: The Lion of St. Mark's Square in Venice Is Chinese

[wizzwizz4]

I should not have posted a comment that simply contradicted you. My bad.

The first mentions lead once. The second does not mention any region of present-day China, as far as I can tell. I can't see the information there.

[ceejayoz → wizzwizz4]

Different sources have different isotope proportions and amounts, permitting fingerprinting of region and sometimes specific mines.

The first link explains how we use isotopes in this fashion. The second explains that lead has some useful ones.

[wizzwizz4 → ceejayoz]

I have re-read the question, and this does answer the very last words of it.