Things You'll Need
Instructions
Examine the writing for areas where the letters appear to be burning through the paper. Civil War-era ink contained iron gall, which eventually corrodes and will burn through the paper with a rust-like coloring.
Observe the color of the ink. Most ink used in the mid-19th century was not pure black, but a dark blue called India ink. It contains iron gall that causes it to turn brownish red with age. Letters that are pure black with no trace of reddish color at the edges betray a more modern ink.
Compare the writing to any machine-printed elements on the paper. This is particularly useful with bank notes. If the ink of the signature matches the ink of the printed material in color, this is a sign that the signature was printed. During the Civil War, only the Confederate 50-cent notes of 1863 and 1864 had printed signatures rather than hand-inked ones.