This by no means contradicts what you say but I think it's worth clarifying for readers who aren't quite grasping this. This material makes things (nearly) invisible, but that is not to say they can't be detected by the human eye. It may be a fairly effective camouflage at night but I don't think it would be particularly special. During the day (or in artificial light), it's a terrible camouflage and the infiltrator would stand out like the proverbial sore thumb because even at a goth or emo gathering, they'll be so much blacker than anything else, the guards' eyes will be drawn to them. Of course, technically, the guards won't see the infiltrator, just a human shaped patch of nothingness but still, technically getting shot to pieces isn't any better than the old fashioned getting shot to pieces.

BTW, I find your sig very offensive. Please remove the word "like", it is very misleading (although it is a lot better than my whoring abomination below, I really must change it!).