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It may naturally occur in us––or backboned relatives–– to provide magnetotaxis. We know it is found in many organisms.
On Mar 1, 2010, at 4:26 PM, Earl Stirling wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
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>
> 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
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>
> 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
>>
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Charles Carlson
Senior Scientist
exploratorium
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San Francisco, CA 94123
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Tel: 415-561-0319
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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.
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