[ Neal frowns, picking at the ink, feeling the paper, getting up close and personal with the cleaner parts of the map. He carefully avoids touching the blood. ]

It's rag press paper, hand-made, not milled, which means early 1800s. Hand drawn, slight blurring along the outer edges of the lines. The ink is clear, not much fading, little damage to the paper, which rules out iron gall ink. Probably some mix of gum arabic, soot, and water, which is appropriate to the period. [ Neal leans back, frowning. ] I have no idea how to date the blood on it, but the map itself is at least two hundred years old.