Has anyone used this film extensively from the late 80s to early 90s? I know Velvia 50 replaced it. I shot some 4x5 of this film in late 80s, but didn't really get a good idea of what the film could do. I've also heard it didn't keep very well past its expirey date as even after 1 year it went magenta. Anyone know what the RMS number was for this film? RVP 50 was around 9.