Gold or any other metal does not have DNA...of course, but do have specific atomic structure which in a way we may take as its "DNA".... I guess Hung wanted to point on some specific feature which makes gold different than other metals and unique. We can name many features here. Which one Hung has on his mind..i dont know.
About corrosion; gold does not corrode, yes it is a fact. But gold also is producing (in time) certain patina. I really can not explain what exactly it is (actually i can...read more). But i guess it present some inpurities that gold "reject" in time, under objective influences.
Also you forgot one very important fact; if we are talking about golden items in soil, than you must know those are not made from 100% gold, but from various alloys. Usually gold was mixed with Cu,Ag and Fe in ancient times. To be specific on this we must take exact item and study it and it's origin, history, krafting technique and civilisation (habits) which made that item. Than we will know exact metal percentages in that alloy.
So...if it was Au/Fe alloy than it is no wonder to find some corrosion in traces on item surface, no matter it is golden. More Fe in that alloy - more corrosion....etc...etc...
You understand what i want to say?
Do not consider term "gold", oftenly used here, as pure 100% gold. But keep in mind that it was most probably some alloy.
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