Invisible ink uses the color change of an acid-base indicator in an acidic or alkaline solution. In addition to applying the principle of acid-base neutralization in chemical changes, other chemical reactions such as precipitation reactions, oxidation-reduction, formation of complex ions, and catalytic reactions can also be used to prepare invisible inks. After invisible ink is written, coded and printed, it is invisible to the naked eye, and the content can be clearly seen through the medium or specific light. Take the invisible ink used by the coding equipment as an example, let’s analyze it below. Most of the invisible inks used in invisible ink jet printers use ultraviolet invisible ink. The content of the code is irradiated by ultraviolet light (200-400nm), it can be clearly visible only under specific ultraviolet light, and it is displayed as invisible under ordinary light. When the ultraviolet light is removed, the content of the code will disappear. The invisible inkjet coding technology of the invisible ink inkjet printer
is mostly used for more special product anti-counterfeiting purposes. The anti-counterfeiting effect is good, because the coded content is invisible to the naked eye, but can be seen through ultraviolet light. In addition, the invisible ink printing code does not affect the overall appearance of the product surface because the content of the code printing is invisible to the naked eye, and the anti-counterfeiting is very beneficial. Invisible ink inkjet printers can also print invisible barcodes. Invisible barcodes need to pass through a scanning gun with a specific light to read their content, which is of course invisible to the naked eye. .