Sandy King (sanking@hubcap.clemson.edu)
Sun, 07 Mar 1999 22:39:27 -0400
Yes, ammonium dichromate will work fine in the reversal bleach, you just
need less of it. One substitution rule that I remember off hand is for
every 100 parts of potassium dichromate substitute 85 parts of ammonium.
Sandy King
>Although it may not be as interesting as drama and it's not coming from
>one of the lists superstars... It's just that I can't find a
>description in my (very limited supply) of photography books the
>difference between potassium dichromate and ammonium dichromate. The
>Bleach chemistry in Mr. Lawless's article on reversal processing ( I
>too have recently received PF) calls for potassium dichromate... and
>what I have on hand is ammonium dichromate. If anyone would care to let
>me know if these chemicals are interchangeable... or if I need to order
>the potassium dichromate, it would be of a great help to me. Other
>information about what they are and how they work is always of value...
>thank you for your time,
>garimo
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