Experimental Analysis on the Measurement of the Formation Time of Carbonless Copy Handwriting by “Fading” Gray Value Measurement Method

Carbon free carbon copy paper is a special writing material, which often appears in many commercial disputes and cases. The handwriting identification of carbon free carbon copy paper has often become one of the key factors in case adjudication. However, the existing handwriting inspection methods of carbon free carbon copy paper are not effective, and cannot analyze the law of the formation time of carbon free carbon copy handwriting. For this reason, this paper proposes an experimental analysis based on the “fading” gray value measurement method to determine the formation time of carbon free copy handwriting. The characteristics of solvents have an important impact on the formation of handwriting. Therefore, this paper analyzes the characteristics of the existing main pen solvents in terms of fading and copying ability. In this paper, according to the characteristics of carbonless copy characters, combined with the gray value measurement method, the calculation method is optimized. The optimized method is more suitable for the determination of the formation time of carbon free copy handwriting, and has the advantage of simplifying the calculation steps. In the specific test experiments, the relationship between extraction rate and time change, handwriting reproducibility and other items are tested. The experimental results show that the extraction rate of carbon free copy handwriting decreases rapidly with the increase of formation time, and gradually tends to be stable. In this paper, the characteristics of the solvents and colorants for pen and their influence on the formation of handwriting are analyzed. It is concluded that the types and use of solvents and colorants have an impact on the formation time of carbon free copy handwriting.