Destroyed Chambers
Does Valve use color correction entities for their destroyed maps? If so, what sorts of settings do they use.
[spoiler][SP] Alternate[/spoiler]
There are only four RAW files in materialscorrection, which would lead me to believe CC isn't used as extensively in Portal 2 as it was in Portal. That being said I haven't checked many of the stock maps, so I can't accurately say.
Also, none of those four RAW files are labeled destroyed or similar.
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However if you take a close look at the global_ents instance... (as far as i know) every relay/setting enables a certain colour correction. I've been using whichever looks best in my destroyed chambers... don't care if it was actually intended for clean chambers 
Like i said...just choose whichever one looks best... well if you intend of keeping your own fog settings then its difficult... i'd say just mess around with the global_ents a bit... try different ones.. and if you find one that suits you, you can copy/paste and alter the fog settings more to your liking.