[alt-photo] Re: Gum over cyanotype question

[Keith Gerling]

How long is the gum wash?  Could you have really hard water, with
alkalinity that is bleaching the cyanotype?  Personally, I think your level
of dichromate is rather high, but then I've only used K.

On Mon, Feb 27, 2012 at 11:23 AM, Willen, Matthew S <willenm at etown.edu>wrote:

> Yes, with gel/glut. Maybe it's to give it shot unsized. M
>
> On 2/27/12 12:07 PM, "Henry Rattle" <henry.rattle at ntlworld.com> wrote:
>
> >Matt - is your FA HP sized before the first coat? I sized with
> >gelatin/formaldehyde before starting, and found this paper got pretty
> >slick
> >after a coat or two.
> >
> >Henry
> >
> >
> >On 27/02/2012 16:21, "Willen, Matthew S" <willenm at etown.edu> wrote:
> >
> >> Hi Francis
> >> Fabriano Hot Press extra white, 300 lbs
> >> Potassium, 1 part gum, part mixed gum/pigment, 2 parts Na dichromate
> >> Gum exposure about 8 minutes under a bank of 12 uvbl bulbs.
> >>
> >> --Matt
> >>
> >> On 2/27/12 10:57 AM, "francis schanberger" <frangst at gmail.com> wrote:
> >>
> >>> These will probably help the discussion:
> >>>
> >>> What paper are you using?
> >>> What is the gum sensitizer mixture? (ammonium or potassium dichromate)
> >>> (1:1
> >>> or ?)
> >>> How long is your gum exposure?
> >>>
> >>> -francis
> >>>
> >>>
> >>> --
> >>> francis schanberger
> >>>
> >>> www.francisschanberger.com
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