Re: plea to chemists

From: Christina Z. Anderson ^lt;>
Date: 11/11/05-08:57:25 PM Z
Message-id: <018501c5e735$66ba1040$4f6992d8@christinsh8zpi>

OHMAGOSH this is a great idea, Dane!!! I will do so immediately.
----- Original Message -----
From: "Dane Johnson" <>
To: <>
Sent: Friday, November 11, 2005 7:47 PM
Subject: RE: plea to chemists

> Christina,
> Try contacting Dr. Robert Chapman through Photo Techniques magazine
> ( for some solid chemistry information.
> He periodically authors the Photochemistry column for the magazine.
> According to the Jan/Feb 2005 issue: Contributing Editor Robert
> Chapman holds a Ph.D. in chemistry from Yale University. He has
> worked in photo research and development departments of DuPont
> and Unicolor, and spent many years exploring the photochemistry
> of holography. Currently, he is an independent photochemistry
> consultant and a professor at Eastern Michigan University.
> Thus, he can probably be contacted either through the editors
> of Photo Techniques magazine or Eastern Michigan University.
> Good Luck!
> Dane Johnson
>>--- Original Message ---
>>From: "Christina Z. Anderson" <>
>>To: Alt List <>
>>Date: 11/10/05 5:47:55 PM
> For the first time since I started teaching Experimental Photography,
> Safety
>>and Risk Management has more or less told me today that I can
> no longer
>>teach the mordancage process because of the chance of toxic
> gas, etc.
>>I have talked with 6 different chemists over the last three
> weeks about
>>whether toxic gas is released with the process. None of them
> have said so.
>>But Safety and Risk Management does.
>>I am NOT pouring glacial acetic acid directly on copper chloride.
> Here is
>>the formula:
>>Into 750 ml water pour 80ml glacial acetic acid.
>>Add 30g copper chloride and stir.
>>Add water to 1000ml..
>>At time of use, this "Part A" is mixed in equal amounts with
> 20v hydrogen
>>peroxide. The print is submerged in this for a few minutes,
> rinsed (but not
>>always well) and then redeveloped into developer or toner, such
> as thiourea
>>or sepia.
>>The last person I talked to said that in the dilution I am using,
> the acetic
>>acid will reduce the copper chloride to a salt, not a toxic
> gas (e.g.
>>What do you chemists think?? Jon Bailey, Judy Siegel, etc.,
> you've taught
>>this process before; what do you know?
>>The students are very unhappy at this turn of events, as you
> can imagine.
>>But I would not want to teach something that has this kind of
> danger to
>>students, either. So I really need to know the bottom line here...and
> it is
>>frustrating that there is conflicting information between chemists
> and
>>Safety and Risk Management. That said, SRM is the final word,
> so I would
>>have to convince them they are wrong.
>>I just don't have any close chemist friends short of this list
> :)
>>Thanks in advance,
Received on Fri Nov 11 21:01:53 2005

This archive was generated by hypermail 2.1.8 : 12/01/05-02:04:49 PM Z CST