Ortho means orthochromatic while litho means lithographic. In general,
ortho and litho are different, with ortho just meaning a film not sensitive
to red while litho is a very high contrast film, usually requiring a
special developer. Kodalith Ortho was both ortho and litho, while Kodalith
Pan was litho but not ortho. Ilford Ortho+ is ortho but not litho. Is
that confusing enough? :-)
Kodalith is a very high contrast film that is either black or clear and has
no gray tones at all. It's just the thing for making zone plates. I think
Contrast Process Ortho is a high contrast film, but not as great as
Kodalith, and does not require the special Kodalith developer. A bit of
info on Contrast Process Ortho 4154 is at:
http://www.kodak.com/cluster/global/en/professional/support/techPubs/f2/f2.shtml
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From: "Brigitte Harper" <[email protected]>
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Regards,
Brigitte.
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