Francesco Curcio (msepa.fcurcio@ntt.it)
Fri, 05 Mar 1999 10:17:16 +0100
Nash Computer Technology wrote:
>
> I’m sure this topic will have been covered before, but I haven’t worked out
> how to trawl through the archives yet.
>
> I’m still using the Ziatype kit I purchased a few months ago. I’ve kept it
> in a cool place in a light-tight case, but I believe that the ammonium
> ferric oxalate (solution 1) is liable to go “off”.
>
> As I am a low volume user, I’d rather not keep purchasing fresh solution
> from the USA every few months. I’d like to be able to make up fresh
> solutions myself when required.
>
> As a non-chemist, I’m a bit confused about the various sections in “The New
> Platinum Print”. Do I really need a sink faucet vacuum aspirator and vacuum
> flask, buchner filter, and ph papers (I haven’t a clue what this equipment
> is).
>
> Basically, I’d appreciate some instructions on making Ziatype solution 1,
> including what raw chemicals are needed.
>
> As ever, thanks in advance.
>
> David Nash
David,
there is a very simple solution to your problem: buy Ammonium ferric oxalate
-also called Ferric ammonium oxalate- (this is the right chemical for Ziatypes,
NOT Ferric oxalate) from a supplier of chemical products, it comes in bright
green crystals that are readily soluble in distilled water (10 g in 20 ml,
then bring water to 25 ml and you have got Ziatype solution 1).
In the solid form it keeps for a reasonably long time (years) if stored in a light
proof jar (an obvious caution, even if it becomes sensitive to light only when in solution:
I have exposed the crystals to bright sunlight and still found the solution made from
them worked fine).
The cost should be negligible (here in Italy I buy one Kg for $10.00, but you will find
probably higher prices), considering the small quantities involved, and I often
throw away a half used solution after a couple of weeks without much pain.
Francesco Curcio
Milano Italy
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