Re: BOBs post about POP.......................DuPont Velour Black

  Hi Martin,
  I think the others on the post mean- silver nitrate that oftens washes out
a bit when doing the first step to POP processing (water bath to clear the
silver nitrate).
  Hope this helps,
  Susan
  www.susanhuber.com
  ----- Original Message -----
  From: "MARTINM" <martinm@SoftHome.net>
  To: <alt-photo-process-l@sask.usask.ca>
  Sent: Monday, July 18, 2005 11:01 AM
  Subject: Re: BOBs post about POP.......................DuPont Velour Black

> ----- Original Message -----
> From: Randy Hendrix
> To: martinm@SoftHome.net
> Sent: Monday, July 18, 2005 5:48 PM
> Subject: Re: BOBs post about POP.......................DuPont Velour
Black
>
> > I don't know if you are familiar with that POP but it is probably a
silver
> > chloride > emulsion with some other silversalts such as citrate,
tartrate,
> > etc. and will have >excess silver present.. and typically will need
it
> > there during exposure and >processing. I am also more or less set up
for
> > their production and could easily do > some testing I imagine.
>
> No, I am not familiar with POP and I have no idea how to handle silver
> citrate etc. in that context. If it was a purely silver chloride based
> emulsion (and in case you would want to stay with a silver chloride
> emulsion), you could change the ferric EDTA bleach to:
>
> Ferric EDTA..............20g
> zinc chloride...............10g
> water...........................1L
>
> I didn't quite understand the "excess silver present". Are you saying,
when
> it gets into the developing solution it will set off physical
development?
>
> Martin
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> ****
> Hi Martin,
>
> I don't know if you are familiar with that POP but it is probably a
silver
> chloride emulsion with some other silversalts such as citrate, tartrate,
> etc. and will have excess silver present.. and typically will need it
there
> during exposure and processing. I am also more or less set up for their
> production and could easily do some testing I imagine.
>
> That has been another thing on the to do list... for way too long.
>
> I am very interested in both of these posts and your ideas.
>
> BTW, did Ryuji go away or are you still going at it off list?
>
> Thanks, and see you again at a latter time, somewhere else!
>
> Randy "Ray"
> ----------------------------------------------
>
> BOBs post:
>
> Martin, I have some old Centennial POP which is showing significant
> fog.
>
> I understand that it has extremely fine AgX crystals. I don't know if
> they use a chloride or bromide salt to make it. Might a rehalogenating
bath
> work on it?
>
> Can you recommend a formula?
> CHEERS!
> BOB
>
>
> Do you Yahoo!?
> Yahoo! Mail - Helps protect you from nasty viruses.
>
>

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