From: Jack Fulton (jefulton1@attbi.com)
Date: 02/19/03-08:47:06 AM Z
Pete:
This is an interesting idea . . is it the acid? Could one use muriatic or
acetic acids in place of the sulfuric?
Jack
> How about a 1% solution of sulphuric acid as a clearing bath this has worked
> for me in my TemperaPrint process.
>
> Pete
>
>> Richard,
>> One of the problems that I've always had with reversal deveopment is that
>> I never seem to get completely rid of the yellowish/greenish/brownish stain
>> left over from, I presume, the dichromate bleach, I've tried clearing baths
>> other than just the sulfite with not too much success. I tried the
>> permanganate bleach long enough ago that I've forgotten the results, but
>> obviously they weren't encouraging. Naturally, there is always the odd time
>> when everything comes out just right with no apparent change in technique. I
>> think they (the great they) do that just to make us even crazier. Do you have
>> any insight as to what might solve this problem?
>> One of the reasons that I pursued reversal processing in the first place
>> is that theory says that the more sensitive (and larger) film grains which
>> develop first, are then removed in the bleach leaving the finer half of the
>> silver bell curve to create the finished transparency. I would have to say
>> that my observations tend to bear this out, and make it tantalizingly worth
>> doing, especially with 35mm, and 4x5 can be extraordinary. They also bear out
>> the fact that you have to be about as careful as is if you were exposing
>> color transparency film if you want consistant results. Thoughts?
>>
>> Bob
>
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