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Hey Katie,

A follow up on the suggestions:  some variation on the solution we use  
for our "Liquid Litmus" exhibit should work.  It's a couple of pH  
indicators and the solution if close to neutral.  It should be a  
pretty straightforward proposition.  You can contact me off line for  
details.
Charles
On May 29, 2008, at 8:30 AM, Katie Stofer wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology  
> Centers
> Incorporated, a worldwide network of science museums and related  
> institutions.
> *****************************************************************************
>
> Hi all -
>
>
>
> I'm wondering if anyone has ever found an effective method of "un- 
> coloring"
> water in order to re-color it a few minutes later. We'd like to  
> demonstrate
> the swirls of clouds in a hurricane with a quick demo of water in a  
> bowl
> that's stirred and then we add a couple drops of food color - the  
> color
> moves out in bands like a hurricane's clouds. What we'd like to  
> avoid is
> throwing out each bowl of water so that we can do this more as a  
> cart-based
> activity (repeated multiple times in an hour), rather than a one-at- 
> a-time
> demo.
>
>
>
> We're thinking diluted bleach, but would like to avoid it if possible.
>
>
>
> Other thoughts on what we could use to visualize the bands (small  
> particles
> that could be filtered, etc.) are appreciated as well.
>
>
>
> Thanks,
>
> Katie
>
>
>
> ------
>
> Kathryn Stofer
>
> TerraLink Exhibit Manager
>
> Maryland Science Center
>
> 601 Light Street
>
> Baltimore, Maryland 21230
>
> p 410.545.5976
>
> f 410.545.5974
>
> http://www.marylandsciencecenter.org <http://www.marylandsciencecenter.org 
> >
>
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Charles Carlson
Director of Life Sciences
exploratorium
3601 Lyon St.
San Francisco, CA 94123
[log in to unmask]
Tel:   415-561-0319
Fax:  415-561-0370






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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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