RE: Masking

Matthew, I use ruby tape on the back side of the sandwich to cover the
negative that may exhibit this. There are several other options. First if
you are making enlarged negs, make an even bigger neg with plenty of edge
room that will allow you to use the negative density to help block that
spill or piping. The neg on top will be sharper with thinner ruby lith. You
might also consider coating your paper with a tighter tolerance, less margin
of overcoating. I have noticed that some emulsions or more prone to the
light fog on the paper.

Good luck.
Eric

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
 
> -----Original Message-----
> From: Matthew Baily [mailto:info@creativefauna.com]
> Sent: Thursday, June 29, 2006 2:55 PM
> To: alt-photo-process-l@usask.ca
> Subject: Masking
>
>
> Hello all,
>
> I have a problem that some of you may know the answer to or recognize.
> When I mask the negative by placing a rubylith window on top of the
> negative between it and the glass of the contact frame I get a fine
> line of exposed emulsion (develops out to be a fine line on all four
> sides of the image) where the edge of the negative is. But, the mask
> window is smaller than the image on the negative and covers the edge of
> the negative. When I place the mask between the neg. and paper the
> problem goes away, but the contact is poor at the edges of the images.
> Do you think light could be travel horizontally through the negative
> and causing an exposure at it's very edges ( a bit like fiber optics)?
>
> I TAed for a professional platinum printer ( Arkady Lavov) and he told
> me this would happen and that I should just place the mask between the
> negative and paper, but he never told me why. Does anybody else
> recognize this problem or am I just mad?
>
> It really bugs the hell out of me. Any help would be much appreciated.
>
> Matt
Received on 06/29/06-04:31:32 PM Z