paper towels as acid/base indicators?

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From: Geoff Ruth (gruth@leadershiphigh.org)
Date: Wed Dec 05 2001 - 21:10:15 PST 

Message-Id: <a05010423b834adf09bee@[192.168.1.163]>
Date: Wed, 5 Dec 2001 21:10:15 -0800
From: Geoff Ruth <gruth@leadershiphigh.org>
Subject: paper towels as acid/base indicators?

Today in lab I noticed that paper towels I used to clean up some
spilled weak base (dilute sodium hydroxide) turned pink, while those
that I used to clean up some spilled weak acid (vinegar) turned
green. How cool is that? Does anyone have any idea of what the
chemistry is going on in here?

- Geoff

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