From: Harald Leban (hleban@telering.at)
Date: 05/20/01-12:54:03 PM Z
Ken,
you are able to identify the ferricyanide by mixing it with a solution of an
iron salt ( -Iron(II)sulfate for example-) - if the mixed solution gets dark
blue it was a ferricyanide . Dichromates don´t show such reaktion with iron
salts .
You can check this also with a simple iron-nail etc.. - what´s happend is
the same like a cyanotype .
Harald
-----Ursprüngliche Nachricht-----
Von: "Ken Sinclair" <photo1@telusplanet.net>
An: <alt-photo-process-l@skyway.usask.ca>
Gesendet: Sonntag, 20. Mai 2001 20:32
Betreff: chemical identification
> Greetings all,
>
> I seek some helpful information from a someone with a more recent and
> formal chemistry education... mine is becoming rather "long in the tooth".
>
> A friend has cleaned out his darkroom and I am given two brown glass jars
> containing about three to five hundred grams of chemicals.... neither of
> which is now labelled.
>
> I am assured that one contains potassium ferricyanide and the other either
> potassium or sodium dichromate.
>
> The contents of the two jars seem quite similar in "texture" and colour.
> Since I believe I can make use of the contents once identified, does
anyone
> know know of a ready and simple way to identify which might be which?
>
> Ken
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