The Tyndall Effect is light scattering by particles in a colloid such as a very fine suspension. Also known as Tyndall scattering, it is similar to Rayleigh scattering, in that the intensity of the scattered light is inversely proportional to the fourth power of the wavelength, so blue light is scattered much more strongly than red light.
We invite you to test other brands yourself to make sure you are getting a colloid -- you will not be able to ascertain if its SILVER but you can do some testing for yourself.
All you need is a red laser pointer.
Please watch the short video presentation below which provides PROOF that
DeFeNDR_CS Colloidal Silver is truly authentic.