Let us tell you a story about nothing but us.
Unbleached sometimes, sometimes not, that's what they discuss!
We were fabricated by some type, and that type had a needless lane.
Magical we might be, the future probably, we shall never go in vain!
One of us resides in each line here. Yes, every single line. Top to the bottom. We can't deny.
Don't you ask us our size. If you do, we won't lie!
We might look unvaried, we were meant to be. But it's just fine.
Okay, let us give you a little hint, the hint is our length, which is fifteen minus nine!
HINT
Sorry, no hints. You have already got all the hints up there :)
ACTUAL HINT
Only one of the answer(with max votes) rightly revealed a good amount of things in the riddle. Went close but didn't hit the right answer and hence was unable to explain all the lines. Answer needs a little bit of scientific knowledge. Only line 23 has a little bit of word play.