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.

BTW, what did you find convoluted about the test? I just gave all the
details to be clear and maybe the abundence of detail made you think I'm
doing something very complex. It's not - actually that was the result of my
very first test. If your comment is about the way I'm preparing the emulsion
mix: I have to mix a standard emulsion (same amnt. Of pigment / gum and
dichromate) in order to calibrate with the PDN system. Everything has to be
as constant as possible. I just added gum to the tube pigment until the
saturation and density seemed right to me (not too dark and opaque, not too
light). I find Schmincke Cerulean blue tone pretty dark (hence my comment
"acceptable density with one gum coat, sligthly lighter than single coated
classic cyanotype").

Regards,
Loris.

-----Original Message-----
From: Katharine Thayer [mailto:kthayer@pacifier.com]
Sent: 01 Aralık 2005 Perşembe 17:36
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Why multiple exposure (was Re: (Gum) Tonal scale)

On Dec 1, 2005, at 12:34 AM, Loris Medici wrote:

>
> Hi Judy, I was making tests for tricolor gum. I'm trying to find the
> right amnt. of pigment, gum and dichromate + strength of dichromate:
>
> The pigment (tube) is Schmincke Cerulean blue tone (PW 4 + PB15:3)

This seems to me a rather convoluted way to print with pthalo, but whatever
works for you....

I didn't see Judy's original post quoted below. I would agree with her that
it would be remarkable to see a one-coat made with very dark heavy pigment
that printed 8 steps, But I would disagree with her statement that
experienced printers can't expect more than 6 or 7 steps even with a lighter
pigment/mix; I routinely print 8 to 10 steps when I'm printing the
midtones-highlights layer of a (monochrome) image, or one of the layers of a
tricolor. But Judy and Loris, I think, are talking apples and oranges.
Judy's talking about a one-coat gum that is printed with a very dark-valued
pigment; Loris is talking about tricolor, where the darkest values are
created by overlaying three layers, none of which are as dark as the darkest
tones in the combined image.

Katharine
Received on Thu Dec 1 14:07:32 2005