RE: ORGLIST: Interested in measuring sun exposure via predictablereaction

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From: Yuehui Zhou (yuehuizhou$##$hotmail.com)
Date: Sun Jul 17 2005 - 20:03:32 EDT


photochromic dyes may do this job.




>From: ZenHog@aol.com
>To: everybody@orglist.net
>Subject: ORGLIST: Interested in measuring sun exposure via predictablereaction
>Date: Sun, 17 Jul 2005 17:52:01 EDT
>
>I hope I'm using this list and group correctly  - I just joined.
>
>I'm interested in measuring how much sunlight gets to a particular spot.
>
>Here's what I have in my mind that would achieve the result I'm looking for..
>it doesn't have to be exactly this method but this would be ideal:
>
>I envision a small card  or strip of paper (like litimus paper strips) that
>was immersed in a chemical that is predictably reactive to sunlight. As the
>exposure increases it would change color - and when a measurement is desired the
>color of the card would be compared to a chart.
>
>Is this possible? Is there such a chemical in a form that can be used like
>this?
>
>Thanks for your help,
>
>Craig Nelson
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