Does not fade like standard UV pen and needs no overseals to protect the mark. The pen offers a bright UV mark when exposed to UV light, this will allow you to mark your property (as recommended by the Police) There are also more fun uses such as decorating garments and accessories for clubbing! We advise that you also use a UV light so you can see what you\'re writing, choose a real UV light such as our Counterfeit keyring or Inova X5 UV torch. Your mark is totally invisible to the naked eye and will only become visible under UV detection similar to Smartwater or the counterfeit markings on bank notes, passports and driving licences. No need to buy extra Overseals to protect UV markA brighter UV markDoes not fadeIdeal for marking personal property