Re: (Gum) Tonal scale

David,

This sound interesting but it's the full tonal print that causes me the
problem and I assume there must be as many definitions of that as there are
people making prints.

Thanks
Yves

----- Original Message -----
From: "davidhatton" <davidhatton@superonline.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, November 28, 2005 10:31 AM
Subject: Re: (Gum) Tonal scale

> Hi Yves,
>
> It's my understanding that at least three exposures are necessary for a
> full tonal print. Could be more or less but it goes something like
>
> Highlights :- little pigment + long exposure - say 2 minutes
> Mid tones :- More pigment + less exposure - say 1 minute
> Shadows :- Max pigment + least exposure - say 30 secs.
>
> Understand this is the principal not necessarily the practice.
>
> Hope this helps
>
> David H
>
> Yves Gauvreau wrote:
> > Hi everyone,
> >
> > I wonder if someone knows what kind of tonal scale (range) one
> > can expect with gum printing when using a certain number of exposure for
> > the same print???
> >
> > I assume density will build up, thus increasing the range between the
> > white of the paper and the darkest areas. I suspect also that these
> > multiple exposure are not linearly additive meaning that if I get a
> > density of say 1.0 somewhere on the first exposure I wont get 2.0 with
> > the next exposure.
> >
> > Thanks
> > Yves
> >
> >
> >
> >
> > ------------------------------------------------------------------------
> >
> > No virus found in this incoming message.
> > Checked by AVG Free Edition.
> > Version: 7.1.362 / Virus Database: 267.13.7/182 - Release Date:
11/24/2005
Received on Mon Nov 28 11:36:43 2005