U of S | Mailing List Archive | alt-photo-process-l | Re: fogged digital negative?

Re: fogged digital negative?


I know exactly what you mean.
This problem happened to me several times with both the Pictorico and the Agfa Copyjet.
The only way I found to overcome this, was to let the OHP to dry for several days without any permanent contact with any other surface, like a film sleeve.
I think that the problem is in chemical interaction with with the ink with and the paper before the negative is completed "cured". When I said several weeks I mean at least two weeks.
If I don't respect this drying period I'll notice some funny "fogging " patterns that fit perfectly with the contact zones of the OHP film with the paper.

My DN's are printed with the Epson 2200.

I hope this helps

Manuel Gomes Teixeira

On Apr 12, 2008, at 9:25 PM, Gregg Kemp wrote:

I was printing some cyanotypes today and one of my digital negatives seems to have "fogged". I've printed with this negative 3-4 times before, with fairly consistent results. But today it added a dark ring around the print. When I looked at the negative, it looked OK on the inkjet side, but the other side had a strange, silvery fog to it. The effect was to lighten the negative and print out darker around an area about 6 inches in diameter.

Is this a normal problem for a digital negative - a short life span? Or did I do something wrong - maybe use it too soon after printing the negative. I don't remember how long I waited before using it to make a print. But I've used it several times over several weeks. I'll make another negative, but just wanted to check here to see what I may have done wrong. The negative requires a 9 minute exposure for the cyanotype and paper I'm using. I'm printing with a UV lightbox that's around 26 x 20 inches or so, and about 4 inches from the bulbs.

- Gregg