Re: sodium citrate, ammonium citrate, bleeding of borders

I use sodium citrate for printing kallitype, and sometime with
palladium (though for palladium I prefer potassium oxalate). What I
use is Trisodium Citrate, C6H5Na3O7, 258.07. When mixed with
distilled water the resulting pH is about 7.0. I bring this down to
about pH 6.0 by adding more citric acid to the mix, and this has a
big impact on printing. One could also add citric acid to an ammonium
citrate solution to reduce pH.

In any event, I do agree that it would be best to test these two
solutions at the same pH to create a valid comparison in printing
characteristics, because pH does make a big difference, and you
especially want to avoid allowing the solutions to become slightly
base.

Sandy

>Oh pooh, Roger! I threw away the jar. I knew I should've kept it.
>
>I got it from Tri-Ess when it was in business, but since they closed
>I threw away the catalog, too, so I can't even check back. But if
>someone has an old catalog of TriEss it would be in there. I know
>it was written on the label, anyway.
>I had no idea there were three types!
>Chris
>----- Original Message ----- From: "permadocument" <info@permadocument.be>
>To: <alt-photo-process-l@usask.ca>
>Sent: Monday, July 24, 2006 2:18 AM
>Subject: 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
>>TVA: BE 0438 246 889
>>web page: <http://www.permadocument.be>
>>
Received on 07/24/06-09:15:19 AM Z