![]() However, it remains visible forever afterwards, because the heat of the ink triggers a chemical reaction with the paper. The classic method among secret inks works because the writing only becomes visible when the paper is heated. Marketing Tracking - numbering documents to identify demographics.Vouchers and Coupons - authenticity marking.Concerts & Events - tickets and hand stamps.Luxury Goods - such as watches and jewellery.Pharmaceutical Manufacturing - prescription medicines and packaging.We have already mentioned some applications for UV-readable inks, but there are quite a wide variety of industries that make use of this ink, such as: For example, in invisible security ink, the taggant is developed to react only with equipment using a UV, infrared, or near-infrared light at a specific wavelength. The microscopic particles responsible for this, taggants, are added to the ink as they react to the proximity of a unique “reader” or verifier.īecause these 'invisible' inks do not have colour by design, most applications of such inks contain a taggant that reacts with a specially designed camera, light, or scanner. Strictly speaking, dyes and pigments are what give ink its colour in most applications, and the same dyes and pigments can be formulated to be naked to the visible eye. Light-activated inks work because they contain substances that glow under different types of light but remain invisible to the naked eye. ![]() ![]() So, how do these inks work and where are they used? Let's take a look. These 'secret inks' are really useful when protecting products with secret information, such as medication packaging or logistics documents. But, did you know that there are also inks that are designed to only be seen under Ultraviolet light? Invisible Ink: What is it and Where it is Used In a previous article, we took a look at inks that change colour when introduced to certain temperatures, known as
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