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
>
>
>
>
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Received on Mon Nov 28 10:05:41 2005