Re: Reversal

[Joel Alpers <joel.alpers@xxxxxxxxxxx>]

Hyponar wrote:
> 
> At the risk of overdoing a good thing I will proceed with my own reversal
> formula.
> 
>                               Positive developer
> 
>       1. DEVELOP  20 min in D-76 with following addition:
>           2 g. Sodium Thiocyanate
>            52 g. Sodium carbonate (mono)
>            3 g. Potassium bromide
> __________________________________________________
>        2. Wash    2 min.
> __________________________________________________
>        3. Bleach    3-4 min in following:
>            10 cc Sulfuric acid per liter
>             9 g. Potqassium dichromate
> __________________________________________________
>        4.  Clear  3min. in Sodium sulfite 40 g./liter
> __________________________________________________
>        5. Redevelop in Dektol with 4 g. Sodium sulfide added  5-7 min
> __________________________________________________
>        6. Wash 2 min and fix
> __________________________________________________
> NOTE: Use ASA 400 for Plus X
> 
> Thanks for your patience.
> George Skelly

George

Thanks for posting. I also have a question: In the first developer,
are the quantities you listed (2g, 52g, etc) to be added to 1 liter
of D-76?

Looks like a nice simple formula. Would you mind if I put it on
the WEB page? For now, it's going on a "private" WEB page (well, not
really --private--, but you have to know the URL to get there, it's
not accessible from my main WEB page). But I'd like to make the
reversal formulas public at some time (provided I get permission
from the various authors).

Are there different "concentrations" of sulphuric acid? Or if I
go (where do you buy that, anyway??) to the sulphuric acid store,
and say "gimme sulphuric acid" I'll get the right stuff???

Interesting that you seem to get a speed increase...

Thanks for posting!

Joel