I think that this is true. I haven't looked at the specs in a while, so I'm not sure. I know that my shots that were at something like 1/8 or 1/4 were dark by about 1/3-1/2 stop, and started to go (cyan/blue)?
can't remember exactly....
one thing I know for sure though is that the modern Ektachromes and Fuji E-6 films are WAY better in the reciprocity times though. sad to say KR can't do this . I'd love it if it could