pardon my ignorance but can some please explain what touche eclat actually does?

[Yorkiegirl]

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fills in the cracks? paints the shadows a bit lighter so they're not so obvious?

It reduces shadows under your eyes, around your nose, makes wrinkles look less visible, and generally makes you look more 'awake'. I love it...but many people on here seem allergic or unconvinced. Boots No7 do a cheapo version which IMO is just as good.

I find it good for the shadows around my nose and those lines between nose and mouth.

If you're from Cheshire, it makes you look like a startled panda IME

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I think TE comes in two shades only - and some places only stock the most commonly used one.

Boots one is fine.

It's wonderful stuff. Not sure what it does for bags but it takes away the dark shadows like nothing else.