Colours I can't understand

Hi I’ve been seeing these colours in various circumstances and always wondered what they represent. Its not front and back colour as you can see they are default. What are they for?

Quads, n-gons.

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I also am getting this effect where it looks like duplicated faces… here the quad on the right I just made and it seems to be Z fighting as I rotate, and you can see the cylindrical shapes (tree trunks with no texture applied) also show this. It seems to be fighting between default face colour and some other.

ooooh, bloomin obvious now… thanks

are there visibility settings for this?
EDIT: I see now its ThomThom’s Quad face tools

Yes, QuadFace Tools > Live mesh analysis

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