From: Tadeuz Jalocha (tjalocha@netexpress.cl)
Date: 11/17/00-07:57:56 AM Z
Hello Belén,
You don´t need any translation. Spanish name is Tiourea and yo will get
it in any chemical supply store.
Chemical formula: (NH2)2CS
Look out for prices! Don´t buy Merck or any similar because they
generally only sell high cost P.A. grade.
Here in Chile i found a distributor called "Distribuidora Cientifica"
who sells generally 1 kg as a minimum. The prices they have are
incredible. I only use Merck for Ferric ammonium citrate.
Saludos
Tadeuz
Belén Martínez wrote:
>
> Thank you very much, Tadeus!
> I don't seek realistic colors, I just want an image!
>
> Can you explain to me what is "Thiourea"? I' ve seek in my dictionary, and
> it not appear...
> Thanks again
> Belén
>
> ----- Original Message -----
> From: Tadeuz Jalocha <tjalocha@netexpress.cl>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Friday, November 17, 2000 12:57 AM
> Subject: Re: Developing color film in b&w chemicals
>
> Hi,
>
> If you want more or less realistic colors try working solution RA-4 with
> +/- 1.5gr Sodium SULFITE per liter. Develop like C-41 i.e 4 1/2
> minutes@35°Celsius. This solution has a really LOW capacity. It develops
> 2 4x5" negs in 300 ml (jobo processor) perfectly. But 4 developed the
> same way become way underdeveloped.
>
> But i suppose, that you dont seek realistic colors so...
> Developing in B/W chemistry gives you 2 possibilities:
> 1.- Complete process (develop, stop, fix ) with B/W chemistry.
> You get a VERY dense negative almost not printable.
> -Now you Bleach in a rehalogenating bleach:
> For ex. (typical c-41 bleach)
> Water 750ml
> Potassium ferricyanide 95gr.
> potassium bromide 21gr.
> water up to 1000ml
> ( you may use a common toning bleach like the one used for thioura-sepia
> toning)
> -Then you reexpose to light. You will need plenty of light.
> -Dry and take to your local developing shop and develop as C-41.
> depending on your first developer and development time, you may get a
> gain of speed, huge grain, heavily saturated colors, and most important,
> a complete control over contrast.
> Printing these negatives will be very difficult, i had negatives that
> resulted with a green mask rather than the typical orange one.
> This process is sometimes referred as "enhancing"
>
> 2.-You obtain a diapositive with some colored mask if you develop in B/W
> developer, wash and redevelop in RA-4 developer after reexposing to
> plenty of light. After that you will need a bleach like above, and a
> common fix to complete the process.
> This process is interesting with the "Poor people's Ilfochrome" -
> process. Just reverse the paper like you did with the film.
>
> And if you get tired of always reexposing to light, you can try a
> chemical fog:
> Brutal fogger (i take NO responsabilites for this formula!):
> Water 750 ml
> Thiourea 5g
> Sodium Carbonate 5g
> Water up to 1000 ml
> Add a few ml of this brew to your second developer and discard after
> use. The developer does not keep after the addition of Thiourea. So you
> have to add it to your developer inmediately before you develop.
> This is in fact a Sepia-odourless redeveloper, so you may experiment
> with toners of this type.
>
> Saludos,
> Tadeuz
>
> Belén Martínez wrote:
> >
> > Hi Stefan,
> >
> > I was thinking about the silver salts for developing
> > and I forgot the color layers; are there so difficult to remove, right?
> > For RA4 developing, you know any kit to do it?
> > Thanks
> > Belén
> >
> > ----- Original Message -----
> > From: 1232-553-1 <1232-553@onlinehome.de>
> > To: <alt-photo-process-l@sask.usask.ca>
> > Sent: Wednesday, November 08, 2000 2:36 AM
> > Subject: Re: Developing color film in b&w chemicals
> >
> > Forget about this idea.
> >
> > You will get a very thin silver image, but nearly totally
> > blocked by layers (don't know the english words) which
> > normaly will be erased by the color chemistry.
> >
> > More interesting is cross processing:
> > High sensity neg film developed extremly long in overworked RA4,
> > transparencys developed in RA4 ...
> >
> > Regards
> > Stefan
> > ----- Original Message -----
> > From: Belén Martínez <belenmartinez@arnet.com.ar>
> > To: <alt-photo-process-l@sask.usask.ca>
> > Sent: Thursday, November 16, 2000 2:53 AM
> > Subject: Developing color film in b&w chemicals
> >
> > Hello list,
> >
> > Somebody have to do that?
> > How about the results?
> > Are there interesting?
> > Thanks
> > Belén
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