With regards to the second picture and where you might have got it from, I first saw it in an email about not taking things for granted. Here's a link: http://sonic200.com/others/tuongphan.htmNot sure if this is what you were looking for though. Abusive comment hidden. (Show it anyway.)
Actually it WILL look black, because the bulb contains air which shows up black on xrays. Dark zones do not simply mean absence of matter. Abusive comment hidden. (Show it anyway.)
Not sure if this is what you were looking for though.