... ,banknote,certificates,passport,label etc. KPT supply Up conversion Infrared IR phosphor for security ink ,currency,banknote,certificates,passport,label etc.UP ... under zero 50 centigrade degree (long time) to 1000 centigrade degree (1hr)Ultraviolet Rays ResistanceExcellentAcid and Alkali ResistanceExcellentStabilityLong term stability, do not ...