Re: plain hypo for fixing film?

[Richard Knoppow <dickburk@ix.netcom.com>]

At 08:26 PM 05/30/2002 -0700, you wrote:
>Richard, thanks for the very complete and encyclopedic answer to my 
>question.  ONe further question:
>
>>
>>   The sulfite should protect the hypo from decomposing from any reasonable
>> amount of acid carried over from an acid stop bath.
>
>Do you still need the sulfite if you use only water for stop?
>
>
>--shannon
>
   Yes, if the fixer is to have any life at all. Without the sulfite it
will begin to oxidize quickly. A weaker solution of plain thiosulfite is
used for fixing POP but its a one shot. For regular film or paper the
sulfite really is necessary. 
----
Richard Knoppow
Los Angeles, CA, USA
dickburk@ix.netcom.com