Answer:
I usually wear a yellow coat. I usually have a dark head. I make marks wherever I go.
White bird, featherless, flying out of paradise. Flying over sea and land. Dying in my hand.
I went to the woods and got it, when i got it didn’t want it, looked for it, couldn’t find it so I took it home.
What is that which, though black itself, enlightens the world without burning?
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?