Re: Pre-shrink paper for gum (oa to Katherine)

I mix gum solutions and coat paper under normal (incandescent) room
lighting. I haven't tested it, but I believe that it would take direct
sunlight to fog unexposed gum prints.

I use an inexpensive office two-hole punch to create the registration pin
holes on one edge of the negative/paper assembly. 'Registration marks' that
print dark against a white background are created on the far corners of the
negative, opposite the pins.

Best regards,
Dave in Wyoming

----- Original Message -----
From: "Breukel, C. (HKG)" <C.Breukel@lumc.nl>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, March 31, 2004 7:10 AM
Subject: RE: Pre-shrink paper for gum (oa to Katherine)

>
>
> > From: Dave Rose [mailto:cactuscowboy@bresnan.net]
> > Sent: Wednesday, March 31, 2004 4:04 PM
> > To: alt-photo-process-l@sask.usask.ca
> > Subject: Re: Pre-shrink paper for gum (oa to Katherine)
> >
> >
> > I pre-shrink and then size Rives BFK with Knox gelatin and
> > formaldehyde.
> >
> > For multiple coating prints, re-registration is simplified by
> > using 1/4"
> > diameter pins, affixing negative to paper. Due to changes in
> > humidity,
> > paper rarely dries out and returns to exactly the same
> > dimensions. If the
> > paper is 'too big', I'll gently dry it further by directing a
> > hair dryer on
> > the backside of the print until my registration marks match
> > exactly. If the
> > print is 'too small', I'll use a damp sponge to moisten the
> > backside of the
> > print, causing it to expand until the registration marks match.
> >
> > I've never experienced any problems caused by using heat or
> > moisture on
> > unexposed prints.
> >
>
> ..Thanks Dave,
>
> I was under the impression that a coated but unexposed print should be
> exposed ASAP, and to be carefull not to expose it too much to room light,
> but seeing your experienc I shouldn't worry about it.
>
> Do you use 4 pins in each corner? (I have a nice printing frame with 2
pins,
> and an ordinairy office punch to punch the fiting holes)
>
> Best,
>
> Cor
>
Received on Thu Apr 1 09:50:14 2004