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Hi Katie--
We've run colored water through charcoal filters in classroom programs,
and this does a pretty good job of getting the water back to clear-ish.
Kristin Leigh
Explora
-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]] On Behalf Of Eric Yuan
Sent: Thursday, May 29, 2008 9:50 AM
To: [log in to unmask]
Subject: Re: 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.
************************************************************************
*****
Hello Katie,
Google "disappearing ink" and you'll find a bunch of experiments
involving a
pH indicator called phenolphthalein that goes from clear (acidic to
neutral)
to red (basic). By changing the pH you can control the color of the
liquid. However, on the second run, it won't work for adding drops of
the
pH indicator to show the dispersion in the "hurricane," since the entire
liquid will turn back to red.
http://www.uwm.edu/~tholme/fun/invisink.htm
http://chemistry.about.com/od/chemistryhowtoguide/ht/waterwine.htm
-Eric
Exhibit Developer
Children's Museum of Portsmouth
-----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
------
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>
Join us for BODYWORLDS 2, now through September 1!
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