Well, I can confirm that it works fine.
I got 1 quart of kiwicol 225 emulsion which came with 7.6g sensitiser. Surmised that the poster in dyetansfer would have used sensitiser for 1 gal so extrapolated that and diluted mine with 22ml luke warm water. I used 2ml/50ml glop for an 8x10 tissue. 12g/l pigment, 60g/l sugur, 70g/l gelatine.
Used 1/2 my usual exposure and have a good 10 steps on a 21 step stoufer, obviously underexposed with no good black. It looks very much like 4 or 5% Ammonium Dichromate to me.
The catch, it stains everything that comes in contact with the tissue a strong yellow.
At this stage it is very expensive printing, but if it can be had seperate from emulsion and provided it clears ok, its the way to go.
PS the stain seems to be a charachteristic of RC paper, it does not stain much when you transfer to the back, or maybe I didnt mix it enough when I poured. In the Todd Gangler video it is a double transfer, the first transfer to albumen sized melinex or something like melinex, therefor stain is less of a problem. Where did I read how to clear it?
It is not as sensitive as AD, 3rd transfer=20 min exposure (still going), 1st was 3 1/2 min for 10 steps, 2nd was 9 min for 13 steps, no black. I have another tissue sensitised at double the rate to try.
20minutes is coming close to a good black, 15 steps. My normal exposure with digital negs and 2%AD is 9min, that would be contrastier than this diazo.
Ok, this is a quote from the ultrastable thread to keep it all in one place for me.
When all four colors have been processed and fully dried, residual
chemicals are removed by immersing the print in Clearing Bath A for
1 minute, followed by a brief cold water rinse and then placed in
Clearing Bath B for an additional minute. After a final rinse, the
print is dried and ready for finishing.
Stock Clearing Bath A:
Water (at 110 F) 930 ml
Potassium Permanganate 6 g
Sodium Chloride (Table Salt) 14 g
Stock Clearing Bath B:
Water (at 110 F) 940 ml
Sodium (Meta)Bisulfite 30 g
Sodium Sulfite 30 g
To make working solutions of A and B, dilute each in cold water at 1:20."
All of this is easy to get and the only thing I dont have are condes crystals
This is definately workable for colour and multiple transfer, not sure that the dmax is there even with stronger sensitiser strength.
Last edited by mdm; 07-13-2011 at 12:12 AM. Click to view previous post history.