Ink Analysis is a forensic technique used to identify and compare different types of ink found on documents. This process can help determine the authenticity of a document or reveal alterations. By examining the chemical composition of the ink, experts can trace its origin and age. The analysis often involves methods like chromatography, which separates ink components, and spectroscopy, which identifies their chemical structure. These techniques allow forensic scientists to match inks from questioned documents to known samples, aiding in criminal investigations and legal disputes.