[alt-photo] Re: Zia standard solutions

[Colin]

Loris, please never dumb-down your posts, I get enough of that from American 
media.  Personally I don't come here to make pictures, but to learn about 
the process of making pictures. To use intelligent language associate with 
process isn't showing off, if anything it shows respect for the intellect 
and curiosity of readers of this list.



----- Original Message ----- 
From: "Loris Medici" <mail at loris.medici.name>
To: "'The alternative photographic processes mailing list'" 
<alt-photo-process-list at lists.altphotolist.org>
Sent: Wednesday, July 21, 2010 3:26 AM
Subject: [alt-photo] Re: Zia standard solutions


> You're welcome Terry.
>
> BTW, to clarify / correct a misunderstanding: My workshop / private lesson
> suggestion wasn't for chemistry at all, it was "specifically" about "how 
> to
> to make the 'laypersons' understand the basic chemistry principles that we
> 'may' use in creating alt. process artwork"... This makes part of all my
> alt. process workshops - and I haven't a single "willing" participant that
> didn't understand what I've teached to them, can't help the (non-willing)
> others - I'm not Superman, in fact!
>
> Regards,
> Loris.
>
>
> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org On Behalf Of
> Terry King
> Sent: Wednesday, July 21, 2010 12:07 PM
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: [alt-photo] Re: Zia standard solutions
>
> Dear Loris
>
> Thank you for the explanation which would  need further explanation on a
> workshop.  While I fully accept that an understanding of the chemistry is
> important, remember that people have come to make pictures.
>
> Thank you too for the offer of a one to one explanation but I did look 
> into
> this when my daughter was doing her GCSEs in 1994.  I have not needed to 
> use
> it since as the concept of percentage dilutions is more easily grasped.
>
> Useful background would be a list of molar concentrations for the 
> different
> states of chemicals used in alt processes with a separate column relating 
> it
> to saturated solutions expressed in percentage terms. One could refer to
> this list if someone wants to know what the dilution should be when, for
> example,  only an anhydrous compound is available.   Is this something you
> would like to prepare for our benefit ?
>
> Would it be helpful though in deciding which of the four states of EDTA
> would be used in clearing a platinum print ?  As  I find that Willis's
> method using 1% HCl is more effective, this would only be of academic
> interest.
>
> Terry
>
>
> -----Original Message-----
> From: Loris Medici <mail at loris.medici.name>
> To: 'The alternative photographic processes mailing list'
> <alt-photo-process-list at lists.altphotolist.org>
> Sent: Wed, 21 Jul 2010 8:43
> Subject: [alt-photo] Re: Zia standard solutions
>
>
> Molar concentration helps where there's more than one variant of the
> compound in the market, for instance, at various hydration states. E.g.
> citric acid = anhydrous / monohydrate, trisodium citrate = dihydrate /
> pentahydrate, oxalic acid = anhydrous / dihydrate, palladium chloride =
> anhydrous / dihydrate and so on... If you know the molarity (instead of 
> w/v
> %) of the solution(s) you want to mix, then you can use each and every
> variant of the compounds, by making a simple ratio calculation in order to
> learn the equivalent weight of the replacement variant. If you don't know
> the molarity, you're bound to the "specific" variant the formula calls 
> for,
> and sometimes that's really a problem - when you can't find it for
> instance...
>
> I do also give workshops Terry, would you like to take few lessons (a
> private workshop) from me in this issue? (Explaining the principles to 
> music
> publishers and theology PhDs and such...) And that would be with the added
> bonus of making visit to our beautiful Istanbul... ;) :P
>
> Regards,
> Loris.
>
> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org On Behalf Of
> Terry King
> Sent: Wednesday, July 21, 2010 2:32 AM
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: [alt-photo] Re: Zia standard solutions
>
> ...
>
> Try explaining to us what advantages ' .7 m '  offers over the equivalent
> percentage solution figure, then imagine explaining the same thing, and 
> how
> you would measure it, to a workshop containing music publishers and 
> theology
> PhDs who have come to make pictures.
>
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