Colloidal Silver: What's the Tyndall Effect?

The Irishman, John Tyndall, was born August 2, 1820. For a long period of time he was associated with London's Royal Institution as a renowned physicist with wide-ranging interests. Much of his research popularized science. His original scientific contributions, embodied in over 180 research papers, covered a wide variety of topics ranging from diamagnetism and sound transmission to glacial movements and mountaineering.

John Tyndall was best known for his study of light scattering (the Tyndall effect) observed when a light was shined through a specific type of liquid suspension. In numerous books, articles and addresses he explained science to the layperson, urged public support for research and advocated the philosophy of scientific naturalism. He died at the age of 73 on December 4, 1893.

In his work, Tyndall noted that some liquid suspensions scattered the light when a light was shined through them, so they seemed to glow. He also noted that many suspensions didn't scatter the light. The light passed through without any visible effect. As he documented which suspensions scattered and which did not, a pattern began to emerge. In time, he determined there was a narrow band of suspensions in which light was scattered.

These suspensions that scattered the light are now known as colloids. Thus, today, a normal test for determining whether a suspension has any colloidal characteristics is to shine a light through the suspension and determine whether the light is scattered. If the light is scattered at all, it exhibits the Tyndall effect and will be classified as a colloid. If the light is not scattered in any way, then it will not be considered a colloid.

After identifying whether the suspension exhibits any Tyndall effect, the next step is to determine how strong the Tyndall effect is. A weak Tyndall effect suggests that only a small part of the suspension is colloidal. The stronger the Tyndall effect, the more of the suspension is colloidal.

Suspensions which are almost entirely colloidal will only look transparent when the light source is shining directly through the suspension into the viewer's eyes. Otherwise, at other angles of light, it will look translucent (meaning: cloudy - where the particles scatter the light even though you can't see the particles). Thus, the colloid will change from transparent to translucent and back again simply by changing the angle of light to the viewer.

Some colloids exhibit such a profound Tyndall effect, even normal room lighting is adequate to observe the effect described in the previous paragraph. In such cases the suspension is likely almost entirely colloidal. We call such suspensions, super-Tyndall colloids. Such colloids would be considered the highest quality.

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