screen printing?

[trigger_of_rock]

i'm supposed to be doing screen printing in a design class at achool today and i was wondering if any of you were familiar with what they use to make the ink. not sure of what kind it is or anything, but maybe if someone had a general idea?
i don't know if i'm really gonna be a stickler about it, because it's true that i don't know what other inks are made of (pens etc) but it seems like a thing to look into.

thanks for any help.

x-posted