From: Michael Cooper <mcooper**At_Symbol_Here**EXPONENT.COM>
Subject: Re: [DCHAS-L] Still Another Question
Date: Mon, 26 Aug 2013 20:08:33 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: E9CB014D17C8F849A299E388A9F8D35924D35680**At_Symbol_Here**

Have experience using a Varian ~10 tesla NMR to erase various magnetic media.  Very quick and effective, just ensure there are no metal parts on the media which would pull it into the magnet.



with regards,



Michael N. Cooper MS, MPH, CIH

Senior Managing Scientist

Exponent® / Failure Analysis Associates

149 Commonwealth Drive, Menlo Park, CA  94025

( TEL +650 688-1760 7 FAX +650 688-1799 CELL +408 313-2127

Email: mcooper**At_Symbol_Here**  




From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of ILPI Support
Sent: Monday, August 26, 2013 8:41 AM
Subject: Re: [DCHAS-L] Still Another Question


VCR and reel to reel use magnetic methods to store information - you're talking iron and/or chromium oxides on plastic film.   Microfiche (microfilms) come in various types, one of which is the classic silver film negative, yes.  But others are all organic - for example, diazo compounds.


I would assume snuggling your recorded videocassettes up to an NMR magnet would take care of scrambling them.  I'd love to see an empirical test by someone on the list.


Rob Toreki



Safety Emporium - Lab & Safety Supplies featuring brand names

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On Aug 26, 2013, at 10:20 AM, Rortvedt deZero <rortvedt**At_Symbol_Here**HOTMAIL.COM> wrote:

Has anyone ever characterized VCR, reel-to-reel or microfiche for silver to ensure they're not a hazardous waste?

Date: Mon, 26 Aug 2013 09:41:58 -0400
From: bt_quant**At_Symbol_Here**YAHOO.COM
Subject: Re: [DCHAS-L] Still Another Question

If you are mainly trying to destroy the info on the tapes, I recommend a magnetic bulk tape eraser.


New ones seem expensive, but there are several used ones on e-bay, etc.

Lew M.


On Aug 23, 2013, at 6:25 PM, "Murphy, Dr. Ruth Ann" <rmurphy**At_Symbol_Here**UMHB.EDU> wrote:

Thank you for all your helpful responses to my question about hazardous high school chemicals.  One more question has arisen:  How could an organization dispose of 300-400 videocassette tapes with sensitive information?  I was asked about chemical treatment – or burning, and would appreciate your advice. 


Ruth Ann



Ruth Ann Murphy, Ph.D.

Professor of Chemistry

Chairperson, Department of Chemistry, Environmental Science and Geology

Chairperson, Health Professions Advisory Committee

Amy LeVesconte Professorship of Chemistry

JAMP Faculty Director

Goldwater Scholarship Faculty Representative

The University of Mary Hardin-Baylor

900 College Street

Belton, TX  76513-2599

Phone 254.295.4542










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