The oil is also known as non-colour-proof. It is invisible under normal light conditions, but glows in ultraviolet light. For paper and human skin, for use in ink at the entrance to discotheque. It applies to the security of the product, to the marking of important documents, to the entrance of places of entertainment or to the creation of special effects. There are no visible traces of the invisible after the seal, the markings are not visible under ordinary light and can only be clearly seen in the uv light, and the markings disappear immediately after leaving the uv source. This seal can be used for human skin. I don't know
I don't know
I don't know
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