Re: fogged digital negative?

[Manuel Gomes Teixeira <punctumgt@netvisao.pt>]

Gregg,

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