Four people with red and blue hats: who knows their color?

[K.J.Healey]

Delete this thread... the riddle itself is flawed, since it says the people in line can only see the person in front of them. IF it said "persons" then there'd be more info, but still not enough. It is also titled as a logic problem, not a "the wall was transparent!" riddle.
I don't think there's an answer.

 

[D H]

Edit added:
Just realized this is an old revived thread from the distant past. Is it just me, or has that been happening a lot this weekend?

There was a firestorm of necromancy this past weekend.

 

[Redbelly98]

I'm wondering how and why people dig up these old threads. You have to go the 10th page of thread topics in "Brain Teasers" to get to when this thread was started. Do people searching back that far just not realize how old the thread is, or do they realize it but find it so interesting that it still merits a response?

I'm seeing that the thread was revived in April this year by a one-time poster, so in this more recent revival it was only 2 months old.