Meaning
Physical processes describe the gradual evaporation of liquid solvents from ink or adhesives into the surrounding atmosphere over time. In forensic paper and contract examinations, measuring solvent volatilization allows specialists to determine the age of a disputed document or signature. This analysis provides a scientific basis for identifying whether contracts or administrative logs have been backdated to deceive regulators or business partners.
The rate of this process depends heavily on environmental conditions such as temperature, humidity, and airflow.
Analytical Methodology
Technicians measure the remaining volatile compounds in an ink stroke by extracting tiny paper samples and analyzing them with gas chromatography or mass spectrometry. Because different types of ink evaporate at varying rates, analysts must run comparison tests against reference databases to ensure accuracy. If the level of volatile solvent is high, it indicates that the document was signed recently rather than on the historical date printed on the paper.
Judicial Value
Reports from forensic laboratories that document this evaporation process are frequently accepted by Chinese judges to settle disputes over contract dates. This scientific evidence can quickly resolve allegations of fraud or corporate misconduct during court proceedings.
Environmental Limit
Extreme heat can accelerate the evaporation process and distort the age calculation.