Re: sodium citrate, ammonium citrate, bleeding of borders

Dear Chris,

Can you tell us what sodium citrate you used; monosodium (pH= 3,4-4,0),
disodium (pH=5,0) or trisodium (pH=7,5-9,0)?
Thanks,
Roger

-- 
Roger Kockaerts
Permadocument - pH7
Rue des Balkans, 7
B-1180 Brussels
Tel.:32-2-347 66 76
Fax: 32-2-344 43 04
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web page: <http://www.permadocument.be>
On Sun, 23 Jul 2006 21:09:20 -0600, "Christina Z. Anderson"
<zphoto@montana.net> said:
> Well, a kiss for Bob Kiss--
> I tried the sodium citrate and presto, no bleeding of borders.
> 
> However, since I ran out of Platine and my order isn't coming thru
for a 
> week, I had switched to Cranes Cover/Platinotype.  Therefore, I
wondered
> if 
> the reason for no bleedoff was the paper and not the developer.
> 
> I decided to be fair to am citrate and bit the bullet, mixed 'em both
up
> and 
> today printed side by side 12 prints, half developed in sodium
citrate
> and 
> half in ammonium citrate.  These are all my results for anyone who
cares, 
> and I would LOVE if anyone chimed in with different results before I
go
> and 
> accept it as gospel:
> 
> As I think Eric and Sam said sodium is warmer than ammonium--it has a
> yellower tone to it than ammonium which is redder.  Hard to see
unless
> side 
> by side and you scrutinize.
> 
> Sodium is a titch less contrasty, too.
> 
> Ammonium is a bit faster--printing less than 1/3 stop faster, though,
> probably 1/6-1/4 stop by my eyeball calcs--in other words, on a 31
step 
> tablet it wasn't a full step.
> 
> NOW (ta da) about the bleeding of borders, My am citrate is always
> darkened 
> with metal; since it was all I used I didn't think anything of it.
> HOWEVER, 
> when I developed all these prints today in sodium citrate, the
developer 
> stayed clear.  No bleeding of borders.  And the Cranes Cover prints
that
> I 
> developed in ammonium citrate did bleed slightly (not like Platine)
in
> the 
> developer, so my conclusion is the bleeding is both paper and
developer 
> related, and maybe another reason in there, too. But it was enough of
a 
> revelation to want to stick with sodium citrate, frankly.
> 
> That's it for today!
> Chris
> CZAphotography.com