DECIPHERMENT OF INVISIBLE INK THROUGH DIFFERENT TECHNIQUES

Abstract

Invisible inks have become the latest and the most common tool used by the criminals for committing different type of white collar crimes. They are used for committing crimes related to documents like wills, cheque, property papers, deeds, financial documents, bills, contracts and many other important documents. These invisible inks have become the most common tool for document related forgeries. Different brands are available in the markets which provide invisible ink pens, the most common and the oldest brand is Pilot. Hamley hamster, Cello, Vikson and many other brands also manufacture these invisible ink pens. Thermochromic erasable ink and disappearing ink are widely used for the same purpose. Thermochromic erasable ink is the one which depends on the temperature. They are also known as thermal ink. This thermal erasable ink disappears at high temperature and again become visible when low temperature is provided. The thermal ink pens come with a rubber erasure fitted either on the top or bottom of the pen which can be used to generate heat by friction in order to remove the ink lines. This process of rubbing the ink lines with the rubber erasure disturbs the fibers of the paper. The degree of disturbance depends on the type of paper used and also on pressure used during the rubbing process.