[alt-photo] Re: casein

[Loris Medici]

Hi Keith,

I was using something around 30-45 secs (on a pretty standard UVBL
bank), and still needed spraying for development - it was pretty
robust IME. I don't remember the exact dichromate (AD that is)
concentration, but I'm pretty sure it wasn't above 5%. (Probably 5%,
or maybe 2.5%...)

Hope this helps somehow, good luck. (OTOH, I'm extremely sure you'll
find the method to make it work the way you like - nothing can escape
from you!)

Christina, why not getting the powder version? That's what I have -
and have tested. There has to be some kind of preservative in the
ready-made binder solution. I think it's better to have the powder
form, in order to try/test different casein solution concentrations.

(See the link to the powder product here:
http://kremerpigments.com/shopus/index.php?cat=0210&lang=ENG&product=63200)

2011/2/25 Keith Gerling <keith.gerling at gmail.com>:
> ...
> But while we are on the subject, maybe I can ask a couple of questions of
> anybody that has worked with casein.  I believe Loris mentioned that the
> exposure is less than with gum.  Is that the case?  How much less?  Loris??
> Any comment?  In my case, I cut the exposure back by 20% and the prints
> still needed some heavy brushing/rubbing/spraying to clear.  The emulsion
> was rather opaque compared to gum, and the print was rather similar to a
> temperaprint.  Had the print been on paper, I doubt it would have survived.
> So maybe i need to cut the exposure waaaaay back.