It is possible to observe the "Tyndall Effect" with no silver particles at all. Here is a good explanation of this.: http://math.ucr.edu/home/baez/physic.../blue_sky.html A decent red laser pointer at exactly 650nm and constant power output regardless of battery condition is far more reliable. They are available on ebay for as little as $9.00. Stay away from any made in China. Best Regards, Arnold Beland www.atlasnova.com
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