Again, this "4th layer" (actually a sub-layer to the middle one) is
only found in Fuji's consumer Superia and all their professional
color negative films. It's not in *any* of their E-6 films,
consumer or professional.
-- John
I thought that Velvia also had an extra layer, a black layer to
provide the extra dense blacks needed for lithography
--
Winsor Crosby
Long Beach, California
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