Visualization of thermochromic ink & disappearing ink writings through various techniques on different paper surfaces
Das Anamika, Suneet Kumar, Sudhir Kumar, Sayeed Ahmed · International Journal of Medical Toxicology & Legal Medicine · 2022
Invisible ink are becoming a popular tool for committing various economical and financial frauds. Temperature dependent erasable ink and pH indicator disappearing ink both are widely used for this purpose. In this research paper we have explained different techniques to decipher these invisible writings. Examination through Photoshop software and U.V. Cabinet are very cost-effective, non destructive and easily available technique to decipher these writings. Chemical examination through iodine fuming, NaOH or KOH are also very effective and reliable method but they are destructive in nature. Visualization of invisible writing is best done by viewing the samples under the spot light and U.V. light available in Video Spectral Comparator -8000.