Blacklight-sensitive print on a security label remains invisible in daylight and artificial light. As known from the authenticity control of money bills, black-light sensitive areas can only be detected under a special lamp. In principle, blacklight-sensitiv printing can be overprinted with individual data via thermal transfer printer.
Blacklight-sensitive printing is done with prefabricated foils. Three different film types are possible:
The first film type shows a readable print image under normal light conditions, like any standard print. In addition, a standardized pattern visible only under black light appears within the printed areas.
The second option uses a film that prints exclusively blacklight-sensitive. The printed image created in this way, e.g. company logos or texts, can therefore only be seen illuminated accordingly.
As a third version, the complete security label is covered with a blacklight-sensitive laminate. Blacklight then illuminates the entire label surface, but not the data imprint.
When a PRIME-Guard Label is applied, the white permanent adhesive bonds between the transparent label areas to form an almost opaque layer. An attempt to separate again the firmly adhering adhesive surfaces of the label once closed causes the adhesive film to tear in a defined structure. The label areas show a transparent triangle pattern. It cannot be revised, not even by fitting the separated surfaces together exactly. This makes every manipulation attempt obvious and verifiable.
When first attached, the permanent adhesive bonds the adherent label surfaces so tightly that an attempt to reopen the label will split the material into layers.The split label areas are unglued, so they do not stick and cannot be rejoined immediately. The label cannot be easily reapplied but is permanently damaged.
Guard Labels based on Destruct material with a split effect act as a preventive measure against fraudulent reapplication of labels once removed to goods that have already been used.