invisible ink
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Transparent Invisible Ink nrog Fluorescent Cwj mem Dip Cwj mem rau Chaw Muag Khoom Tsis pub twg paub / xyaum lo lus / Tes Account Mark
Khoom Muag Khoom Muag Tus cwj mem cwj mem, iav cwj mem number case, 18 ml non-carbon magic invisible ink UV Teeb Fluorescent number case, zais lus sau tus cwj mem, Khoom plig. Tsis-carbon Magic invisible number case Invisible ink tsuas yog pom nyob rau hauv irradiation ntawm ultraviolet teeb. Cov ntsiab lus sau rau hauv tus cwj mem yuav tshwm nyob rau hauv lub teeb ultraviolet. Xyuas kom tseeb tias cov ntaub ntawv rhiab tseem tsis pom los ntawm qhov muag prying nrog tus cwj mem tsis pom. Cov lus sau nrog tus cwj mem no tsuas yog pom thaum lawv pom ...