Re: Gum preparation

I forgot to add, this could be the solution to dimentional stability, just
work in 100% R.H.

Y.G.

----- Original Message -----
From: "Yves Gauvreau" <gauvreau-yves@sympatico.ca>
To: <alt-photo-process-l@usask.ca>
Sent: Saturday, April 29, 2006 9:36 AM
Subject: Re: Gum preparation

> Katharine,
>
> like you I know I have a good eye for some things. I could in my prime
align
> a peg to within 1/8 of an inch between two other pegs separated by a 100
> feets. Good, maybe but what you do is out of this world, how much would
you
> say one can be off on a 8" x 10" print before people start noticing
> misalignment. Base on other ideas, it is said we can resolve 5 lines per
> milimeter, Sandy King wrote the other day it could go as high as 20 lines
> per mm, that less then 1/1000 of an inch.
>
> Find me an industry anywhere in the world that as to build parts or
objects
> within tolerance of 1/1000 or even only 1/250 (5 l/mm) of an inch and
there
> quality control is done by eyeball...
>
> In your favor I'll add this, some time back you said the relative humidity
> is pretty high and constant where you live, if it's near a 100% you
probably
> don't have shrinking problem to begin with. This would explain away your
> apparent supernatural habilities.
>
> Regards
> Yves
>
>
>
>
> ----- Original Message -----
> From: "Katharine Thayer" <kthayer@pacifier.com>
> To: <alt-photo-process-l@usask.ca>
> Sent: Friday, April 28, 2006 6:52 PM
> Subject: Re: Gum preparation
>
>
> > I've probably said here before that I've never preshrunk paper and
> > that when I was in full production with tricolors, I could tell just
> > by the feel of the paper when it would be the right size to recoat.
> > kt
> >
> >
> > On Apr 28, 2006, at 3:43 PM, Judy Seigel wrote:
> >
> > >
> > > On Fri, 28 Apr 2006, Yves Gauvreau wrote:
> > >
> > >
> > >> I notice the paper I used up to now was changing in size quite a
> > >> bit. I
> > >> simply couldn't do more then a single exposure of a 4x5 step
> > >> tablet on it,
> > >> this mean a larger negative would be a lot worst.
> > >>
> > >
> > > Yves, any paper in any dimension no matter how well soaked or
> > > boiled or treated with incantations, will almost certainly change
> > > size if it's not at the same level of dryness (or humidity) when
> > > you coat. If the humidity is constant where you live, timing the
> > > interval between coats may suffice. Or set up some standard
> > > procedure, which should also help....
> > >
> > > Some years ago I tested 4 different papers with & without presoak
> > > and measured at various stages-- after coating, after drying, after
> > > developing, etc. The paper could expand or contract throughout the
> > > process. We only get a "set" dimension by luck, or paying attention
> > > -- or holding the paper rigid, which is another production.
> > >
> > > J.
> > >
>
Received on Sat Apr 29 07:43:56 2006