> Colour films have their blue sensitive layers at the surface of the
> emulsion.  This is because ALL layers are sensitive to blue so to
> prevent blue light from fogging the green and red sensitive layers there
> is a yellow filter between the blue sensitive layer and the green and
> red sensitive layers.  The yellow filter is removed in processing.

Thanks - that explains a lot (found two rolls of royal rolling around in the
car) - I'll bin the other roll....
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