There is an alternative to laser pointers for viewing the tyndall effect. It is the high intensity lead emitting diode flashlight, such as PALights. One vendor is http://www.wadwizard.com A typical price is about nineteen dollars. Colors available include red, white, blue and green. I find white and green to give the most noticeable TE. A possible advantage to using several monochromatic PALights and/or a polychromatic white PALight is that perhaps an acute observer could discern the effect of adding h2o2 to EIS as it changes the average diameter of suspended particulates. Eyeball spectroscopy, anyone?
Matthew Scanned for virus and spam by McAfee 3200 Appliance
