Δαφνη Ευτυχια Αρθουρος

How much trouble is it to call up a museum or archaeologist and ask them how THEY would authenticate something like gold bullion bricks to a specific period? I'm sure they have ways -- some of which are going to be chemical-analysis related (for characteristic impurities generated by a specific process or something). It's a line of dialog that could have been slightly tweaked and made much more accurate with a few phone calls or emails. (Even saying "according to the lab, this gold was probably purified around X date" and be vague about the exact method the "lab" used...)

We have the Internet now. NO excuses for not researching -- at least enough to find an expert to ask questions of!