[alt-photo] Re: back again

[Keith Gerling]

I'm not clear on whether the lines you get when brush-assist developing the
casein prints are from a too-soft emulsion being scraped away by the brush
or if it is revealing an uneven size or emulsion coat.  I find that with my
casein prints I practically have to scrub the emulsion away and that a foam
brush would never have that result, so if that is the case, you may wish to
increase the exposure.  If is is uneven emulsion application, that *should*
be addressed with the roller application, and so my only advice is to try
other sizes,  Add some marble dust or pumice to the gesso, for instance.
The paper negs should be fine and I would stick to that and work on the
other variables.  It always takes quite a bit of tweaking to get any of
these dicromated-colloid processes to work.

Keith


On Sun, Oct 23, 2011 at 9:04 AM, Matti Koskinen <mjkoskin at gmail.com> wrote:

> hi all,
>
> I used to be on the old alt-photo-process-list at usask.ca long time, but
> when the list moved here, didn't subscribe until now.
>
> Finally I was able to find potassium dichromate and started doing casein
> and temperaprints. I've succeed doing some temperaprints according to late
> Peter Fredrick's method. Don't have any yupo, so I've used watercolour paper
> with gesso. I won't try to do multi coatings, until even a single coat
> works. How long does a dry unexposed temperaprint last?
>
> Also I've been trying casein prints, but I get very bad lines when
> developing a soaked print with foam brush. Probably because of not-so-even
> coating.  I've tried watercolour paper sized with diluted gesso and just
> plain paper. Both show the lines. Then I tried to smooth the mixture after
> brushing with foam roller, but the roller leaves also some marks.
>
> Arabic gum I can't find from any Finnish art stores, also the PVA-glues are
> hard to find, every glue is PVAc, which won't work. That's why I'm doing
> casein and temperaprints, eggs and milk are very much easier to find:-)
>
> I'm using oiled paper negatives made with Epson Photo Quality Inkjet paper,
> as I can go larger than A4. I found Agfa Copyjet in A3 size, but that's too
> expensive for me.
>
> Any ideas?
>
> thanks
> -matti
>
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