1, through the identification of ink components of different handwriting, it can be judged whether it is written by the same pen, and if it is not the same pen, it can be used as the basis for forgery.
2. If the handwriting and seal overlap, it can be seen from the microscope whether to stamp or write first. If the words on the same piece of paper exist before being stamped and appear after being stamped, it is doubtful.
About handwriting identification
1. Summary: Handwriting identification refers to the identification and recognition of handwriting formed by people through writing activities. People's writing habits are concrete and stable, which are reflected in handwriting. Through the inspection of handwriting, we can determine whether the handwriting in the document was written by several people or by one person, and use handwriting to identify the same person and verify the authenticity of the document. We should understand the relevant situation of the case, clarify the requirements for identification, and review the handwriting material evidence and handwriting samples; Analyze and judge whether the handwriting is normal, whether there are changes caused by camouflage or other reasons; Choose stable characteristics that can reflect the writer's writing habits; Compare the samples with the features found in the samples, and find out the coincidence points and differences; Comprehensive evaluation of the reasons for the formation of coincidence points and differences; Make an appraisal conclusion and make an appraisal book.
2. Comprehensive appraisal: handwriting appraisal is the same appraisal. The whole process can be divided into three stages: separate inspection, comparative inspection and comprehensive judgment, and each stage has corresponding but different methods.
3. According to the characteristics and case of handwriting, accurately judge the change or disguise of handwriting characteristics and the reason and degree of change or disguise. If the handwriting proficiency of the sample is consistent, the writing level is adapted to the Chinese level, the strokes are natural, the stroke proportion is coordinated, and the writing action is regular, it can be considered as normal handwriting. For example, the handwriting size and inclination are uneven, the writing speed is inconsistent, the stroke movement is unnatural, and the stroke turning is stiff, but the writing action is systematic to some extent, and the characteristics of the same words and strokes are basically the same, which indicates that it is due to objective reasons or other subjective factors other than camouflage.
References:
Baidu encyclopedia-handwriting identification