Do not buy any antiquity that may have come from conflict zones, like Syria and Iraq
Check with a stolen art database;
Ask about the provenance, then actively check it;
Look at the back of works, outside of their frames;
Ask about forensic testing;
In the movie Black Panther a black visitor confronts a white curator over African artifacts in a fictional British museum. "How do you think your ancestors got these?" the visitor asks. "You think... 