[Alt-photo] Re: Sulfamic Acid for Paper Acidification

[Loris Medici]

Hi Alberto & Serdar,

To me it works better than HCl for Fabriano Artistico TW HP and EW SP side
by side. (Better tonal range and less grain, much more smoother results.
siightly better Dmax - perhaps sulfamic acid leaves the paper in better
physical condition than HCl,???) Maybe I could try different dilutions
and/or treatment times with HCl, in order to find the sweet spot that works
equally well (if there's one) but why fiddling? Sulfamic acid is much
easier to deal with and the stability and capacity of the solution is very
good.

Regards,
Loris.


2013/5/5 Serdar Bilici <sbilici at gmail.com>
>
> Hi Alberto,
>
> Unfortunately, I haven't prepared samples to compare.I started testing
with
> HCl then oxalic acid then briefly tested citric acid. I even tried
tartaric
> acid for fun (it works).
> As I have mentioned in the post, the problems I had with other acids
forced
> me to look for an alternative in the first place.
>
> I did not want to start a 'which acid is better' argument so I did not
> include the problems I observed with the other acids in the forum post. I
> still try not to mention the problems. :)
> I thinks the samples and the advantages of sulfamic acid are fine enough,
If
> people are convinced they would give it a shot IMO.
>
> P.S. I haven't tested vinegar/acetic acid on purpose. Vinegar has
additives
> different brands have different concentrations.
> Concentrated acetic acid fumes is bad for lungs, considering that the
> acidification procedure would take considerable time I did not want that
> kind of exposure due to my asthma.
>
> Regards
> Serdar
>
> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org
> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf
Of
> Alberto Novo
> Sent: 05 Mayıs 2013 Pazar 09:21
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: [Alt-photo] Re: Sulfamic Acid for Paper Acidification
>
>>> I would be pleased to hear your opinions, suggestions for optimizing
>>> the procedure.
>>> I did some test using new cyanotype, argyrotype and Loris did some
>>> testing with ziatype and argyrotype.
>>
>> Sedar, did you compared (by means of step tablet printing) the sulfamic
acid
>> treatment vs other acidifying methods , e.g. HCl, citric acid, etc?
>>
>> Alberto