Wow! People here know a lot.
I thought the "Rosetta Stone" question was a little bit of a cheat because it didn't refer to a color, rather to a place in Egypt - Rosetta, a port city on the Mediterranean coast.
I did check it on wikipedia: There were 3 languages on the stone - Classical Greek, and 2 types of Egyptian script - demotic and hieroglyphics. It was the same message in three different languages which was what finally allowed the linguists to understand/translate hieroglyphics.
