Fluorescing bar codes are more commonly known as covert codes because they are invisible until a suitable light source is used to make them fluoresce and visible. Security codes predominantly use EC200 Data Matrix bar code formatCovert invisible matrix codes can be used for: Unobtrusive marking for label or part identification in manufacture. Tracking of items subject to counterfeiting such as pharmaceuticals. Covert track and trace of restricted distribution products - wines, cigarettes, promo items, Authentication of Branded Items, Warranty tracking of materials, Sporting and other Venue ticket authenticationApplication: The application of fluorescing barcodes requires some care and consideration in the placement of the code, the size, background and localised colours, markings and data.