Someone's offering a flat 16mm print of ROTJ on eBay.
http://www.ebay.com/itm/16MM-FEATURE-FILM-RETURN-OF-THE-JEDI-THEATRICAL-LPP-ESTAR-PRINT-/190651839704?pt=US_Film&hash=item2c63bc34d8
It's basically useless for preservation, since it's cropped, but it's still interesting because not much thought is given to the original color timing of Jedi. I've always assumed that ROTJ had the most consistent color over the years; do these images look different from how the film looked on video?