[Alt-photo] Re: DAS

[Marek Matusz]

Kees DAs was added to the glop at 6% basis dry gelatin I am including scans of my test prints and a perfectly normal dichromate sensitized tissue with typical nice gradation of tones. I have done a 3 minute and 6 minute exposure of DAS sensitized tissue and you can see the expected density shift, but the effect is still there. I am almost thinking it is some kind of side reaction with some chemical that is in my glop mixture. I am making just sugar/gelatin/pigment DAS tissue. ANy ideas of how to go next (less pigment/DAS?). To that effect I flashed the tissue and it seems to have done the trick. My flash was a bit too long (at 1sec), because it fogged the print too much, but it definitely gave me more gradual tone gradation, actually the contrast is way too low as it would requitr negative of logD of over 3 https://plus.google.com/photos/105732508998271877151/albums/5871332081567167153?authkey=CLvJ1J76nZjjhQE Marek
 > From: workshops at polychrome.nl
> Date: Fri, 26 Apr 2013 17:51:41 +0200
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: [Alt-photo] Re: DAS
> 
> Hi Marek,
> 
> Did you put the sensitizer in the pigmented gelatin? Or did you brush sensitize? What concentration did you use?
> I can do a test with the group buy batch next week and do a steptablet test. I also got some and now have 3 different varieties in the studio. 
> Normally DAS steptablet tests show a somewhat longer range than the regular 3 or 4 % dichromate sensitized tissue.
> The irregularity you describe I have never seen. I can print the DAS sensitized tissue with the same negative as the dichromated, with a somewhat longer exposure.
> 
> Kees
> 
> 
> On 26 apr. 2013, at 16:56, Marek Matusz <marekmatusz at hotmail.com> wrote:
> 
> > All,
> > I have purchased some DAS for carbon work. I just made my first tissue and test prints with a step tablet. I will scan and post them later, but I noticed an non-liner response of the tissue to the light. In the highlights I get no exposure and my first visible step is already way dark. It is easier to describe with the picture. My prints are drying and I will scan and post them later.
> > 
> > Does anybody have step tablet tests of DAS sensitized carbon to share?
> > 
> > Marek
> 
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