U of S | Mailing List Archive | alt-photo-process-l | Re: ferri sesquichlorati

Re: ferri sesquichlorati

Thanks, I think I´ll stay with "multiple" layers and avoid exact numbers in
a description I am writing.

Understood that the 20 layer claim was for thinner solutions, Have not done
more than 5 myself..

Will post an "alternative" gum method soon, different than this particular
method. Just need to tidy up things a bit...

On 10/23/06 12:59 AM, "Kees Brandenburg" <ctb@zeelandnet.nl> wrote:

> On 22-okt-06, at 16:06, Halvor Bjørngård wrote:
>> BTW, Is there a maximum number of layers for gum, one book I have claim
>> twelve or so, but have seen other claims of 20 .. ?
> Hi Halvor,
> The maximum number of layers is related to the strenght of the (rigid)
> package of gumlayers and the constantly expanding and shrinking paper
> fibers between wet and dry. I think 20 layersare way too much and only
> possible on a rigid (non paper) surface or on a paper that is made
> rigid by fixing it on a rigid surface.
> My still workable (= near maximum) number of layers is 6 or maybe 7,
> but I try to do with less.
> I also am very much interested in the 'ferric' hardening of gum
> especially from a environmental viewpoint. I'll do some experimenting
> too!
> -kees