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Katie,

You could try using a PH indicator and then add either an acid or base to
change it back to clear depending on what type of indicator you use.

M


On 5/29/08 10:30 AM, "Katie Stofer" <[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.
> *****************************************************************************
> 
> 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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