Re: pinhole paper towels as acid/base indicators?

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From: Geoff Ruth (gruth@leadershiphigh.org)
Date: Thu Dec 06 2001 - 11:58:01 PST 

Message-Id: <a05010404b8357e1fc68b@[192.168.1.163]>
Date: Thu, 6 Dec 2001 11:58:01 -0800
From: Geoff Ruth <gruth@leadershiphigh.org>
Subject: Re: pinhole paper towels as acid/base indicators?

Yeah, they were brown paper towels. So it's some sort of biological,
naturally-occurring acid/base indicators -- like litmus?

Cool.

>Hi Geoff,
>Were those white paper towels or brown ones? The brown ones contain a complex
>mixture of chemicals some of which may respond to pH changes. I do know what
>they are, because there are so many. If you used white towels, they are
>mostly cellulose, resin binder, and a little bleach residue, none of which
>should be pH sensitive or change color as pH changes.
>Neil Fetter
>
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