Etienne,
Why rinse in water after the acid pre-soak? Most people I know who
use the oxalic acid pre-soak just pull the print from the acid bath
and hang it to dry.
Sandy
>Don wrote:
>
>>> FWIW, one fellow on APUG reports that he is successfully using a weak
>>> solution of hydrochloric acid as a substitute for oxalic acid to presoak
>>> paper for palladium printing.
>
>Ryuji replied:
>
>> If this is true, the acid mechanism is more likely than the iron
>> mechanism. That means any reasonable acid that dissolves and neutralizes
>> calcium carbonate and does not interfare with the process being used
>> would be usable for the presoak step.
>
>I'm sorry, I didn't realize this question was on the table. I have used 2%
>hydrochloric, 2% sulfuric, 3% phosphoric, 5% formic, and 5% citric acid for
>neutralizing alkaline papers prior to coating the iron processes (I do Pt
>[no Pd], kalli, and cyano). I rinse thoroughly after the acid bath (final
>rinse in distilled water), and have not noticed any difference between
>them. As far as changes in contrast or scale, I wouldn't say the acid
>changes these parameters -- I'd say that alkaline paper screws up iron
>processes, and must be neutralized before coating to get the "base" results
>for that paper. It's the results on un-neutralized paper that are
>anomalous.
>
>Best regards,
>
>etienne
Received on Mon Aug 15 16:07:10 2005
This archive was generated by hypermail 2.1.8 : 09/01/05-09:17:19 AM Z CST