User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-4388405-20121006181920/@comment-4515675-20121006205648

Well actually they're described as being glazed and gold. No other information is given and think about it, that would have been the perfect opportunity for posses Jason. We know for a fact that they weren't all possessed at the same time. It couldn't be since Percy was not with them on the Argo II when Leo was possessed for example.

They are not possessed all the time so that's why it makes sense. You can't say that it was Jason back then holding her hand so obviously the Eidolon wasn't inside of him. Leo acted normal after he first got possessed and the Eidolon was still inside of him. Percy says how he didn't realize anything was different until the Eidolon left his body.

I mean I would have understood if Jason's eyes would have been completely white like he was blinded by Hera but gold? That doesn't make sense and why would RR even mention the gold color in the first place? Why would the Eidolon turn the color of the ppl they possessed into gold? It just seems to fit too well to be just a coincidence.