Indeed, positive gold ions can react with noble gases, and gold particles just a few nanometres in diameter can act as catalysts in many reactions, as can single gold atoms bound in suitable ...

Background: Positive patch-test reactions to gold that are without obvious clinical relevance are common. We speculate that titanium dioxide in cosmetics and sunscreens may adsorb gold particles ...

While the gold particles may appear microscopic, the net quantity can make up about 80 grams of the valuable element, estimated to be worth $6000, per a study published in the journal Advancing ...