Riddle answer consists of 3 characters and was created by Guest
My blood is black, my kin once flew, I carve my mark, in all I do. Once my work is done, it stays, In notes and letters, through the days. I'm lost, tossed, crossed, and chewed, My journey ends when I'm used. Though my tip may meet its end, My work lives on, my faithful friend. What am I?