Handwriting can be authenticated through professional institutions.

Application for identification needs to be made during the proof period. Take the handwriting that needs to be identified and the real handwriting, and entrust a forensic identification agency to pass the forensic identification method to compare the authenticity.

Handwriting identification can not only test normal handwriting, but also test handwriting that changes in writing conditions (including writing posture, writing tools, backing materials, etc.), deliberately disguised handwriting (including left-hand handwriting, ruler-stroke handwriting), and imitation Handwriting and drawing marks. When the same person writes with the same pen, the pen mark characteristics can also be used to enrich the basis for identifying the writer.

Currently, for forgery, Raman spectroscopy is used to identify the formation time of handwriting very accurately, and it can basically be identified after 3 months or more.

The handwriting features that have been confirmed and widely used in identification mainly include the following: written language features, text layout features, calligraphy level features, font style features, writing style features, typo features, stroke order features, Characteristics of brushstrokes, matching proportions, marks, punctuation and Arabic numerals, and charm.