Please don't break the glass, you are releasing phospher which is considered hazardous waste along with the lead. Here is the condensed version. The lead is in the front glass.
http://en.wikipedia.org/wiki/PhosphorIn a CRT, phosphor coats the inside of the screen. When the electron beam strikes the phosphor, it makes the screen glow. In a black-and-white screen, there is one phosphor that glows white when struck. In a color screen, there are three phosphors arranged as dots or stripes that emit red, green and blue light. There are also three electron beams to illuminate the three different colors together.
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