Fluorescent number case yog ib qho ntawm feem ntau siv cov inks hauv daim pib luam ntawv, thiab nws cov khoom tseem ceeb yog fluorescent xim. Fluorescent pigments yog cov xim ua kom luminescent. Qhov sib txawv ntawm cov xim zoo tib yam yog tias thaum lub teeb sab nraud (suav nrog ultraviolet teeb) irradiated, lawv tuaj yeem nqus ib hom zog ntawm lub zog, thiab cov duab yees zoo siab tso lub zog rau hauv daim ntawv ntawm lub teeb pom tsawg, ua rau muaj qhov sib txawv. Fluorescence ntawm Hawj txawm. Cov xim sib txawv ntawm lub teeb sib xyaw los ua cov xim qaim txawv txawv, thiab thaum lub teeb nres irradiating, luminescence phenomenon ploj, yog li nws hu ua xim fluorescent. Cov xim fluorescent yog sib xyaw nrog cov ntawv sau polymer cob, cov kuab tshuaj thiab tus neeg pabcuam, thiab cov xim fluorescent tuaj yeem npaj los ntawm kev sib tsoo. Tus number case no, uas yog pom tsis tau ntawm lub qhov muag liab qab, tsuas tawm ntawm lub teeb ci hauv ultraviolet lossis duab ci ci ci. Nws yog qhov tseeb vim tias nws hloov tau thiab zais cov yam ntxwv thiab cov yam ntxwv uas nws tsis tuaj yeem raug luam tawm ntawm lub tshuab luam ntawv xim, ua cov kua mem hauv lub lag luam luam ntawv tshwj xeeb yog qhov nrov dua.
Cov inks tshwj xeeb uas tso tawm cov hluav taws xob ultraviolet (200-400nm) thiab emit pom lub teeb (400-800nm) hu ua ultraviolet fluorescent inks. Raws li qhov sib txawv tshwj xeeb ntab ntw, nws tau faib ua luv nthwv dej thiab ntev nthwv dej. Qhov zam lub teeb ntab ntawm 254nm yog hu ua luv luv nthwv ultraviolet fluorescent number case, thiab qhov kev sib tw nthwv dej ntawm 365nm yog hu ua ntev-ntev ultraviolet fluorescent number case. Raws li kev hloov pauv ntawm cov xim, nws muab faib ua xim, xim xim, thiab ua rau xim. Tsis muaj kob tuaj yeem tso xim liab, daj, ntsuab, Xiav thiab lwm yam xim; tinted tuaj yeem ua rau cov xim qub ci iab; qhov hloov xim tuaj yeem ua rau ib qho xim rau lwm xim yog ua tau.