The green line behind the motherboard,what is that?

[9lives]

If you noticed, there are lot of green lines running behind all boards(sound, video and motherboard). What is that? I scratched my board and those lines but I am still able to use it.

Thanks.

 

[Tsaico]

Not really sure, but I think it is a coating to cover the circuits between modules and chips...

 

[gcy]

those are electrical trace(wires). you don't want to damage them.

 

[9lives]

but i scratched them and i can even feel it, the cut is quite deep. funny thing is that i am still able to use it.