On Chroma Dots and how to determine if they are present

[VintagePC]

So I'm curious to know - is there an easy way to tell whether what I'm seeing on my set could be chroma dots or just a different type of noise which appears similar?

I haven't really been able to find good examples of what they look like in a moving picture, just still images.

Can it be determined by examining the schematic/circuitry whether they can and/or will be visible?

Alternately, I have a VCR attached to the set with composite inputs. If I were to feed it the luminance only of an S-video signal and observe the output for the dot patterns, would that work or does the internal VCR circuitry (e.g. OSD generator) re-insert colour information into the signal?

I realise it's an obscure set of questions but I'm curious to learn and start a discussion on it