Sender: |
|
Date: |
Mon, 1 Mar 2010 16:26:33 -0800 |
Reply-To: |
|
Subject: |
|
MIME-Version: |
1.0 |
Message-ID: |
|
In-Reply-To: |
|
Content-Type: |
text/plain; charset=ISO-8859-1 |
From: |
|
Parts/Attachments: |
|
|
ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************
it's not iron filings. they rust, primarily turning to red ferrous oxides
which are not magnetic. black sand is usually magnetite, which really
doesn't oxidize further.
----
Earl Stirling
Swiss Army Knife
e x p l O r a t o r i u m
3601 Lyon St
San Francisco CA 94123
+1.415.353.0401
On Sun, Feb 28, 2010 at 11:24 PM, Suzanne Mallery <[log in to unmask]>wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related
> institutions.
>
> *****************************************************************************
>
> I assume the sand just has iron filings in it? If so, you can find the
> MSDS
> for iron filings by doing a search on those words. It seems like the main
> difference between sand boxes and this type of exhibit is that you're
> presumably encouraging people to use a magnet to concentrate the iron
> filings. Technically iron filings are somewhat toxic if ingested or
> inhaled, although the doses seem to be a bit uncertain. If a very little
> kid swallowed or inhaled a lot of filings they might be able to do some
> damage, but that seems fairly unlikely. The MSDS describes them as
> "slightly hazardous" if inhaled or ingested or with eye or skin contact
> (the
> eye and skin contact is just from the potential for mechanical abrasion,
> but
> I'm not sure that's really much different from regular old sand).
>
> Suzanne Mallery
>
> ***********************************************************************
> For information about the Association of Science-Technology Centers and the
> Informal Science Education Network please visit www.astc.org.
>
> Check out the latest case studies and reviews on ExhibitFiles at
> www.exhibitfiles.org.
>
> The ISEN-ASTC-L email list is powered by LISTSERVR software from L-Soft. To
> learn more, visit
> http://www.lsoft.com/LISTSERV-powered.html.
>
> To remove your e-mail address from the ISEN-ASTC-L list, send the
> message SIGNOFF ISEN-ASTC-L in the BODY of a message to
> [log in to unmask]
>
***********************************************************************
For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.
Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
The ISEN-ASTC-L email list is powered by LISTSERVR software from L-Soft. To learn more, visit
http://www.lsoft.com/LISTSERV-powered.html.
To remove your e-mail address from the ISEN-ASTC-L list, send the
message SIGNOFF ISEN-ASTC-L in the BODY of a message to
[log in to unmask]
|
|
|