the prints is invisible ,but can show colors under the UV light. 1.Deatail: the prints is colorless in outside.but ... can show colors under the UV light.For example:colorless-red.2.Color:colorless-red/yellow ... .Printing way:Offset,Silk screen,ingaglio and so on4.Application:currency,banknote,the label of card,wine,cigarette,cosmetic and so ...