Ink Chronometry Timeline

Verify if the ink type used on a document existed at the purported date of signing.

The standard for historical documents. Highly acidic, often eating through the paper over centuries.

First synthetic dyes introduced, notably Mauveine. Allowed for mass-produced colored inks.

Commercially successful introduction of thick, oil-based ink rolling over a metal sphere. Major Anachronism Marker.

Permanent marker ink delivery system. A "Sharpie" signature dated 1955 is impossible.

Pigment suspended in a water-based gel. Introduced by Sakura (Gelly Roll).