Easiest way to tell the difference between small air bubbles and ich?

[sawellem]

As many of you know, in a highly oxygenated tank with many small air bubbles floating around in the tank, fish often have small air bubbles that attach to the fish. What is the easiest way to identify ich vs. small air bubbles?
Thanks again!

 

[jbvdhp]

I see an "reversed reflection", if that makes sense. The ich spots, in my limited experience with it, are very opaque, and sometimes small bubbles look opaque too, but they have a slight reflection to them.