[skyjeeper]

actually i believe it has more to do with what the diode is doped with. its nothing to do with dyeing the case of the led. if it was there would have been diffrent colors long ago.

the blue led's are fairly new. it was a big deal when someone finally made them. that's why they are becoming so popular on all kinds of electronics now. with the blue they can now make any color. they have led's that have 4 leads. they have 3 diffrent diodes in there. blue red and green. depending on the current applied to each portion they can vary the color.

i was trying to find something that said how it is done, but was haveing difficulty finding anything. i did find that the manufacturers of the blue led's make you sign all kinds of paperwork to prevent reverse engineering of them.