----- Original Message -----
Sent: Tuesday, April 28, 2009 9:33
AM
Subject: Re: Gum over Cyanotypes
Hi Loris,
PS.
The paper should be soaked in fairly hot paper to allow the fibres to move
one against the other and shrink fully. OR you could soak in room temp water
for 12 hours or so
David
On Apr 28 2009, Loris Medici wrote:
Hi David,
The 300gsm
(140lb?) paper had stayed at least 45-50 minutes in room temp.
water (HCl
pre-soak to get rid of the CaCO3 buffer + 5 water bath rinses
to get rid of
remaining HCl and CaCl2) and dried before making the
cyanotype, doesn't
that count for shrinkage? Does the water has to be
considerably warmer than
room temp.?
Thinking again, my practice of cyanotype is to
completely/thoroughly force
dry the paper with a hair dryer before exposure
(to be safe from humidity
fluctuations / which have a very pronounced
effect on cyanotype), maybe
that's the
problem...
Regards,
Loris.
28 Nisan 2009, Salı, 11:17 am
tarihinde, davidhatton@totalise.co.uk yazmış:
>
>
> Hi
Loris,
> Give the paper a good long soak in warm water before you print
any layers
> at all. That's what I do and shrinkage is minimal on the
print sizes
> I produce
> Regards
> David
>
> On
Apr 28 2009, Loris Medici wrote:
>
> I did few gum over cyanotypes
recently and I happen to like them much.
> See
> the most recent
one below here: http://dwarfurl.com/008fa
>
> The print is on HCl
acidified (2 minutes in 2.5%) Fabriano Artistico EW.
> One -1/3 stop
exposed cyanotype layer + 3 gum layers. (1. PR206 5% AD
> +1/3
>
stop exposure, 2. PV19 Rose + PBk9 5% AD normal exposure, 3. PBk9 2%
AD
> +1/3 stop exposure.)
>
> I print the Cyanotype on
unsized paper, then size with 3% gelatin. After
> sizing, the paper
change dimensions and you can't register the
> negative
>
perfectly on the first gum pass - 2mm larger in both horizontal and
>
vertical orientations (print size 10x6.6"), the registration gets
>
perfect
> only in the second or third gum pass. (See the resulting blur
at the
> right
> edge in the middle.)
>
> My question
is: How do you manage to get perfect registration for gum
> over
>
layers?
>
> Any tips and tricks would be highly
appreciated.
>
> Regards,
> Loris.
>
> P.S. I
have read Lukas Werth's method somewhere else: Affix the paper
>
on
> dimensionally stable support - such as an aluminum sheet - with
gelatin,
> print, varnish the print (acrylic binder + mineral spirit)
to
> "protect"
> the gum layer and then put the print in warm
water (this is where you
> need
> "protection"!) to melt the
gelatin and release the print from
> the support.
> I would like
to hear about any suitable varnish that can be used for this
> purpose
too...