Re: P/P and different developers

[Carl Weese <cweese@earthlink.net>]

Sandy,

Thanks, I'll try popping up the amount of solution for a 12x20 and brush it
on fast.

For toning, I found that just 8 drops of platinum or palladium solution in
200ml of 3% citric acid solution did fine for a 1220 print. .25 ml (about
4-5 drops) for a 20x24 is even better though.

---Carl
--
        web site with picture galleries
        and workshop information at:

        http://home.earthlink.net/~cweese/

----------
>From: Sandy King <sanking@clemson.edu>
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: P/P and different developers
>Date: Wed, May 8, 2002, 9:35 AM
>

> Carl,
>
> Thanks for the information about potassium oxalate.
>
> Based on some of my recent difficulties with streaking in printing
> kallitype with 20X24 negatives I suspect that your problem may be due
> to an inadequate amount of sensitizer, and/or and brushing for too
> long. I had been using about 6ml of combined solution for 12X20
> prints and reasoned that doubling that amount should work fine for a
> 20X24 print. However, with 12ml of solution I immediately saw some
> streaking on the 20X24 prints, even though the coated emulsion looked
> very even when dry. I increased the amount to 16ml and the problem
> went away. I think that with small amount of sensitizer the solution
> dries very quickly and once it reaches a certain level of dryness you
> get brush strokes. I think that the key to success is to use a lot of
> solution, then brush it on and even it out *very quickly* before it
> starts to dry out.
>
> I am not certain about the humidity requirements of kallitype but I
> was getting pretty good results in the winter when humidity was
> around 55%, and now it is around 65% and things are still working
> well.
>
> BTW, in making the 20X24 prints I found that I can get full toning,
> as judged by a complete change of color from maroon to neutral black,
> with the #3 platinum solution using just 0.25ml of solution in 500ml
> of water with 2.5g of citric acid.
>
> Sandy
>
>