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You could pump it through a First Need water purifier, they use blue
food coloring to check for leakby so it should remove it. Not sure
what the lifespan of the system would be though. Cost might be an
issue in the long run, the cartridges are not inexpensive.

http://www.generalecology.com/index.htm


> -----Original Message-----
> From: Katie Stofer [mailto:[log in to unmask]]
> Sent: Thursday, May 29, 2008 11:30 AM
> To: [log in to unmask]
> Subject: [ISEN] Re-using colored water
>
> 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
>
>
--
Bear AKA Lawrence Beals
www.lbealsphotography.com
"The price of anything is the amount of life you exchange for it." -Thoreau
PIG DEAD. SOLDIER ON.
--

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