hairvise, about writing with a pencil, in the Ken Burns documentary on the Civil War in the U.S., it was mentioned that during that war the officers wrote many letters in ink, whereas the enlisted men often had to use pencils, for economy and availability. It turns out that the pencil script lasted much better than the ink, so many more of the enlisted letters still exist, whereas many of the letters in ink have faded into oblivion. I found that intriguing. Pencil is just more durable.