The way Gansey nods implies that dangerous makes perfect sense to him. "The things I remember were considered curiosities, I think. Some things were very dangerous, some were just beautiful. Does the word Greywaren ring any bells?" That's a very easy way to discover whether Claudia's objects and his own had any overlap. Every artifact dealer in the US, if not further, had probably heard about the Greywaren.

He sets his chin in his hand. "Personalities imprinting on beloved object. That's fascinating. I wonder what causes that. It sounds like what I'd call magic, but I'm not sure anyone has tried to scientifically quantify the things I'm familiar with or if they just resist quantifying."