From: Judy Seigel (jseigel@panix.com)
Date: 10/13/02-07:02:02 PM Z
On Sun, 13 Oct 2002, Richard Urmonas wrote:
>
> Chemicals are brand new (I have not done any ferric chemistry before).
> just opened the bottle friday night
>
> Ferric Ammonium Citrate: Crystals are a very dark green (looking very
> briefly
> under tungsten light). There are some lumps. The solution is a dark
> green (like a
> green olive oil), when spread of paper by itself it gives a medium
> green.
Richard, trust me on this -- you can look at those chemicals -- in fact do
the entire operation -- in regular tungsten room light. At school we had
heavy duty fluorescents and never found them a problem during mixing,
though better prints if paper is dried in the dark.
In any event, the dry chemical should look fairly soft light green by
tungsten, so if it's dark green it's BAD BAD. I've never seen lumps in it
either... Another bad sign. Should we ask where you got it? Wherever,
send it back.
J.
>
> Potassium Ferricyanide: Crystals are bright reddish orange. Solution
> is a rich yellow colour.
>
>
> > But if you're getting blue on mixing the solutions, I'd also say
> > there's a
> > good chance of contamination. Could either of your bottles have been
> > less
> > than perfectly clean?
>
> The brown glass bottles are new, thoroughly washed. All tools are
> plastic and washed then dried between uses.
>
> Thank you for your help.
>
> Richard
> ---
> Richard Urmonas
> rurmonas@senet.com.au
>
>
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