Re: Why multiple exposure (was Re: (Gum) Tonal scale)

Loris and all,
This is the kind of tonal scale that I routinely get with saturated
ammonium dichromate and a strong mid-dark pigment, mixed the way I like
it. It's a gum truism that the more dichromate, the longer the scale;
the less dichromate the shorter the scale, and in my own tests, that
are available somewhere on my website, I found that when I diluted the
ammonium dichromate to 5%, the number of steps I could get was cut in
half from what I could get with the saturated dichromate. But Loris
is getting the same kind of scale with 5% ammonium dichromate as I get
with saturated dichromate. I think probably Loris is indeed a wizard.
What would happen if you increased the dichromate, I wonder.

Funny, in the grey aambient light of yesterday your upper steps looked
perfectly white to me, but in the brighter sunnier light of this
morning, I can clearly see the pigment stain you were talking about.
Katharine

On Dec 1, 2005, at 12:24 PM, Loris Medici wrote:

> BTW, I've uploaded the scan of the test. Any comment would be
> appreciated.
>
> http://www.loris.medici.name/Gum-Test-01.jpg
>
> It looks like there's some staining (unsized Whatman HP watercolor
> paper) -
> both pigment and dichromate stain (the latter being greenish - I guess
> it
> will clear in metabisulfite... But I will try to size the paper first).
>
> Regards,
> Loris.
>
> -----Original Message-----
> From: Loris Medici [mailto:loris_medici@mynet.com]
> Sent: 01 Aralık 2005 Perşembe 21:47
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: Why multiple exposure (was Re: (Gum) Tonal scale)
>
> Hi Katherine. I was talking about one color / one layer of the
> tricolor. The
> test I did was one coat, one color. I mention tricolor just because I'm
> making tests in order to make tricolors in the future.
> ..
>
Received on Fri Dec 2 13:31:20 2005