Hi Aaron!
On Thu, 10 May 2001, Aaron Reynolds wrote:
>
> Does the hypo have a mixed liquid volume listed on the front? Usually
> for the Kodak stuff it'll say 5L (or whatever) on the front...you simply
> dump the powder into that much water and mix.
>
Nothing such is written on the polythene packet. Only the product name
(Hypo-II), net weight (500 gms), batch no., date of manufacture, expiry
date etc. are written.
> > How shall I make a stock and working solution of fixer? Do I need to add
> > anything else to the solution other than hypo crystal, I think acetic
> > acid.
>
> Fixer is not generally mixed to stock then diluted; rather you mix it
> once and use it as mixed.
Sorry, I didn't know that. I thought that it is just like the story of the
developer.
> Could you perhaps give us a little more
> detail about the chemicals you're using? I'm a little confused. Brands
> and sizes would help.
>
I have a black and white paper developer and it contains two small
packets. Instructions are clearly written of how to make the stock
solution and working solution. The problem is with the packet of hypo.
It is in the form of transparent crystals of cylindrical shape of about
1 cm in height and 3 mm in diameter.
Both the hypo and developer are made by a local brand and they also
manufacture paper. So, the brand name won't be any help for you. Besides
that the whole staff is much cheaper than Kodak chemicals/paper. Since, I
am a beginner in darkroom activity, I went for the chip one. Later, I
shall go for the Kodak chemicals only provided that my hands get trained
in basic darkroom activities.
> As to uprating your film, a rough rule of thumb is to extend your
> processing time by 30% for each stop you're pushing the film. Of
> course, every film and developer combination works a little differently,
> so you'll want to fool around with the numbers a bit until you get a
> good result.
>
This information is very important for me because I shall be uprated
films all the time. Of course, the first hand fooling around is always
there to get the correct combination as you have mentioned.
> -Aaron
Hope this clears some of your confusion but not all perhaps. I will try to
help you as much as I could to help you understand the situation.
I have an idea. If somebody could tell me the concentration of hypo in
fixer meant for paper processing, I can weigh the appropriate amount and
mix into water to get that concentration. In a book titled 'Darkroom
techniques' by Andreas Feninger (a reputed photographer of 'Life'
magazine) has mentioned the method of preparing fixer from hypo crystals
for negetive film processing. He also mentioned that for paper processing,
the concentration of hypo is lower than that for film processing but he
has not quantified the concentration.
Anyway, please see what you can do about this strange problem.
With best regards,
Ayash Kanto.
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to http://www.pdml.net and follow the directions. Don't forget to
visit the Pentax Users' Gallery at http://pug.komkon.org .
