Agar Diffusion
From Genetics Wiki
A simple demonstration of diffusion through agar media to visually illustrate that viruses diffuse through plate media.
Red Food Coloring
This is done with a single drop of food coloring containing FD&C Red 3 and Red 40. Be careful not to disturb the plate and cause the drop to run until it is compltely absorbed into the media.
File:Reddropdiffusion2.jpg
One Hour Later
File:Reddropdiffusion3.jpg
Two and a half hours later
After sitting overnight the liquid was completely absorbed into the media and the plate could be inverted.
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