Re: FW: Negative Cleaning Help

Lisa Reddig wrote:
>
> Katharine,
>
   My only problem is that I printed with it 3 more times
>
> I've been soaking it for a while now.

Lisa,
In my experiment, the dried stuff loosened and started coming off the
negative immediately. In less than 30 seconds I was able to swoosh it
completely away. If yours has been soaking for quite a while with no
sign of letting go, then I'm afraid Sandy may be right: maybe with all
the extra exposure, the dichromate hardened the gelatin on the film and
welded the gum-pigment pieces to the silver emulsion. That would not be
good.

The film I used was T-Max 100, if that makes any difference.
kt

> -----Forwarded Message-----
> From: Katharine Thayer <kthayer@pacifier.com>
> Sent: May 15, 2004 4:55 PM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: Negative Cleaning Help
>
> Well, then I got curious and tried it. I took a 4x5 negative that I
> didn't care about and put it on slightly damp coated paper and exposed
> it for the usual time. After exposure there were all these bits of dried
> coating on the emulsion side of the negative, just as you described. I
> put the negative in the wash with the print and the dried coating washed
> right off.
> kt
>
> Katharine Thayer wrote:
> >
> > As usual, my thinking continues to develop after I've clicked "send,"
> > and it occurs to me belatedly that it's not of course just a matter of
> > coating and film, there's that silver stuff in between, and I don't have
> > any idea how that will affect the ease of removal.
> > kt
> >
> > Katharine Thayer wrote:
> > >
> > > Lisa Reddig wrote:
> > > >
> > > > I am doing some gums today. Something went wrong and I now have pieces of
> > > > pigment/gum/dichromate on the emultion side of the negative. An original
> > > > 4x5 B&W kodak trix negative. Never had anything like this before. How do
> I
> > > > get it off??
> > > >
> > > >
> > >
> > > Hi Lisa,
> > > It sounds like your coating wasn't quite dry when you put the negative
> > > on it, and some of the damp coating mix came off on the underside of the
> > > negative where it touched. I don't know what these other guys are
> > > talking about, paper sticking to negative; that's not what I'm reading
> > > here, but it's possibly of course that I'm missing something. If I'm
> > > right and it's just coating mixture, then it depends... If it's under a
> > > fairly dense area of the negative, it should simply wash off in water,
> > > just like the coating that was still on the paper would wash off at that
> > > place. And even if it's under a less dense area, and therefore
> > > hardened, the film may well be slick enough that the hardened gum won't
> > > stick anyway. From my experiences printing on mylar it would be my guess
> > > that it's harder to make hardened gum stick to film than to make it let
> > > go; I've found that I usually have to use treated mylar, or treat it
> > > myself, to get the hardened gum to stick through development. So my
> > > guess would be that this should wash off in water.
> > >
> > > I would experiment first with putting the negative in water and letting
> > > it sit for a while; hopefully the stuff will dissolve right off. If not,
> > > I'd dab very gently with a damp lintless cloth, and if that doesn't do
> > > it, then I don't know. I've never had this happen with an original
> > > negative, but I've done it a couple of times with digital negatives,
> > > which is a different story. With a paper negative, it won't wash off,
> > > and with a Pictorico negative, water ruins the negative. With a digital
> > > negative it's easy to just print another one. Good luck, and I'll be
> > > interested to know what happens.
> > > Katharine Thayer
>
> ------ End of Forwarded Message
Received on Sun May 16 09:32:32 2004