Curious about the difference in projected nitrate vs safety prints, I once asked Audrey Kupferberg from the AFI about it (~ 35 years ago). She said that there wasn't a difference when it was a really good, properly made safety print. This is in no way meant to disagree with Robert; perhaps she wasn't seeing the difference that Robert has seen. More recently (about 10 years ago), I saw a couple of Technicolor nitrate trailers from '40s musicals with arc light projection. They were stunningly gorgeous, with vibrant color and saturation like I've never seen elsewhere. But whether this was just because they were original prints with real Technicolor processing, or because they were nitrate, I can't say.