Engine Painting

I`ve read that most 69 340`s were blue with a few exceptions being red or turquoise. I once owned a 69 Dart GTS that had a red factory 340. All the others I`ve seen have been blue. As for turquoise (as in 68 383 color), I have personally never seen one but people say they exist. Knowing Chrysler nothing went to waste, so on a particular day if the only engine paint available was pink, then the engines would have been pink. Lol! After 40 years paint will fade. My 68 340 looked to be orange but I know it was once red. I wonder if some of the turquoise engines are actually blue engines that have changed color with time?