Viscid - dead right!!!! Pronounced viss-id here tho.
Yes, more parameters I suppose - but it was interesting just as a byte-size
testlet.....my development times are: 5-min still bath twice, then a
10-minutes still bath - usually mostly developed by then. Any brush dev or
spray done here, then a 15-20 min slow running bath. I never have trouble
with prints washing off UNLESS underexposed. And I've found that adequate
sizing (including between coats) has been the key to banishing staining
forever :) I brush coat with hardened size between emulsion layers, but
always tray size twice with hardener a la Hamish Stewart before printing and
after shrinking (which always washes out some of the original paper sizing).
I have no way of gauging the viscosity of my gum - just make it up as per
the recipe in David Scopick's book and hope for the best. the synthetic gum
I use is VERY viscous - I have now decided to test different dilutions of it
to see which works best with the more dilute amm. di.
Kate
----- Original Message -----
From: "Judy Seigel" <jseigel@panix.com>
> I still think you need to factor in at least 3 defining variables, or make
> that 4. One that's omitted here is the viscosity of the emulsion and its
> twin, development time. My finding was that using a larger proportion of
> water to gum (that is, using more of a dilute dichromate solution that
> made the emulsion thinner, or less viscid) and exposing longer made a
> *harder* print that could stand more development time and thus give a
> longer scale. The highlights held while the shadows peeled back.
>
> In what have become the usual protocols of gum, the highlights -- in soft
> viscid emulsion -- would have washed off. The belief has been (fostered
> perhaps by someone whose name I dare not mention, tho initials are PA)
> that gum will stain if not adequately gum arabicked. I found this not to
> be so if the paper is gelatin sized.
>
> PS. Is that how you spell viscid? But it's pronounced "viss kid," isn't
> it?
>
> J.
>
Received on Mon Dec 15 14:56:47 2003
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