2. Whether the ink color of the signature is consistent, whether the ink color at the intersection of strokes touches the old and new ink colors, and whether the ink color on the crease is coherent or broken;

3. Observe whether there are traces of patchwork, alteration, filling and uneven ink distribution on the document;

4. Compare the width, distance, radian and angle between strokes by measurement.

Extended data:

The expert of document inspection in Zhejiang Hanbo Judicial Appraisal Center said that from the practice of document inspection, it was found that at present, various incidents of altering and forging documents emerged one after another. Most of them are altered through various techniques on the basis of the original documents, which is also called "partially forged documents".

For example, there are common forgery documents by intercepting blank pages with signed handwriting, forgery documents by using redundant signatures when copying signatures, and forgery documents by transferring, copying or scanning signatures.

In the identification and inspection of such documents, we must first determine the authenticity of the signature, whether the signature is different from other words, and then see whether the paper specification is abnormal, and whether the typesetting of the document content is reasonable in word spacing, line spacing, page margins and so on.

Consistency and rationality of document language, and other suspicious traces left on the document. If conditions permit, you can also observe the formation order of characters, paper indentation and so on through instruments. At the same time, according to the case, confirm each other.

Baidu encyclopedia-signature recognition

People's Network-How is the "identification" of altered documents carried out?