[alt-photo] Re: casein cont...

Christina Anderson zphoto at montana.net
Mon Oct 24 16:05:10 GMT 2011

one other thing matti i am using only a 10% potassium dichromate, even less therefore than my usual 15% ammonium dichromate for a 6 minute exposure with gum.

do you mean "no detail" meaning that the highlights lose detail when you brush? or the print in general is low contrast?
Christina Z. Anderson

On Oct 24, 2011, at 9:04 AM, Matti Koskinen wrote:

> I use Patent Grey watercolour which actually is very black. So it may be the culprit for such a long exposures. Temperaprint is something like 10 minutes, same dichromate, but I'm using burnt umbra.
> The casein print isn't over nor underexposed. The image appears by brushing the print lightly. Last paper was coated as tempera, first spreading the mixture with brush and then using foam roller to even the coating. The coating was thicker than  my earlier attempts using lighter coating and brushing, but that leaved bad lines.
> With this thicker layer 40 mins was not enough.  Then I exposed 80 mins, and that made the print very black. Used sodium carbonate bath, and then brusing revealed the image, but with no details. I'll do a new mixture of casein and use Sienna natural and look what kind of results that gives.
> thanks
> -matti
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