From: Alberto Novo (alnovo@inwind.it)
Date: 05/20/01-01:22:57 PM Z
If you have some ferrous salt (Fe II) at hand, mixing a solution of
ferrycyanide to a Fe II solution (or vice versa) you will obtain a deep blue
precipitate
If you have a lead or barium salt at hand, mixing a solution of one of the
previous saltsto a solution of dichromate (or vice versa...) you will obtain
a yellow precipitate. Thys reaction is typical of a chromate (pale or bright
yellow salt) and of a dichromate (orange-yellow alt), but It can be lo a
potassium, sodium, or ammonium salt...
Finnally, if hou havent nor lead, nor barium, nor fe II salts, ... find ann
appropriate way to dispose them.
Alberto
-----Messaggio originale-----
Da: Ken Sinclair [mailto:photo1@telusplanet.net]
Inviato: domenica 20 maggio 2001 20.33
A: alt-photo-process-l@sask.usask.ca
Oggetto: 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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