Nws yog xim hlau luam ntawv number case (nws yog xim hlau luam ntawv) yog hais txog tus number case uas npaj nrog cov xim hlau, uas muaj cov ntawv nws yog xim hlau. Feem ntau hais lus, kua mem xim kub thiab nyiaj kua xim muaj cov inks zoo li no. Cov xim tso xim ntawm cov xim hlau yog feem ntau yog hmoov kub thiab nyiaj hmoov (hmoov tooj liab thiab hmoov txhuas), thiab lwm yam xim tuaj yeem ntxiv rau tsim cov inks nrog cov xim tshwj xeeb, hu ua cov xim sib xyaw xim hlau. Thaum tus kab ntawv yog acidic, lub hmoov tooj liab yuav hnov mob nrog me me ntawm cov leej faj thiab nws yuav yooj yim tig mus rau xim dub; tom qab luam ntawv, nws yuav maj mam poob cov luster nrog cov leej faj nyob hauv cov cua. Yog li ntawd, cov xim kub yuav tseem siv cov hmoov txhuas thiab dyes ua xim ntxiv, tab sis Cov duab lo tsis zoo.
Cov kab ke ntawm cov hlau number case feem ntau siv cov khoom siv roj nrog cov kua qaub qis kawg nkaus thiab tus nqi amine, yog li kom tsis txhob cuam tshuam rau lub ntsej muag ntawm tus number case, xws li ethyl cellulose, nitrocellulose, polyvinyl acetate, ketone resin, polyphthalamide resin, thiab ntxiv qee qhov ciab Los txhim kho lub xeev ncua ntawm pigments. Nws yog xim hlau inks tseem tuaj yeem tsim tau cov kuab tshuaj, tab sis lawv feem ntau npaj rau siv vim lawv qhov qis qis. Lub polarity ntawm qhov hnyav tsis tas yuav ua kom loj dhau, txwv tsis pub cov xim yuav yooj yim los nag ntau vim ntub dej ntau dhau. Xylene, isopropanol cov kuab tshuaj, thiab lwm yam tuaj yeem siv ua cov kuab tshuaj rau cov xim hlau.