Rau kev sau ntawv thiab kos duab rau ntawm lub blackboard, koj muaj ob txoj kev xaiv tseem ceeb rau cov cim:
Traditional Chalk: Cov kab txaij yog ib qho kev xaiv nrov thiab classic rau kev sau ntawv rau ntawm cov ntawv dub. Nws yog tsim los ntawm calcium carbonate thiab tshwj xeeb tsim los siv rau ntawm daim kab dam. Ib txwm chalk tuaj nyob rau hauv daim ntawv lo thiab sau nkaws rau ntawm qhov chaw ntawm blackboard. Nws muab matte tiav thiab yooj yim rau kev tshem tawm siv chalkboard eraser.
Liquid Chalk Markers : Kua chalk markers, tseem hu ua chalk cwjmem, yog lwm qhov kev xaiv rau kev sau ntawv ntawm blackboards. Cov cim no muaj cov cwj mem dej raws li chalk uas dries sai sai thiab ua rau cov xim ci thiab vibrant. Cov kua chalk cov cim ua haujlwm zoo rau ntawm qhov chaw tsis muaj qhov ntxeem tau zoo li cov plooj (porcelain) lossis iav blackboards. Lawv siv tau yooj yim, muab qhov zoo nkauj dua piv rau cov chalk tsoos, thiab yooj yim erasable nrog ib daim ntaub ntub dej los yog chalkboard eraser.
Thaum xaiv ib txwm chalk thiab kua chalk markers, xav txog cov hauv qab no:
Xav Saib: Cov kab txaij ib txwm muab ib qho classic thiab nostalgic tsos, thaum cov kua chalk markers muab lub ntsej muag zoo nkauj dua thiab zoo nkauj.
Kev Siv Yooj Yim: Cov kua nplaum nplaum nplaum feem ntau yooj yim sau nrog, tshwj xeeb tshaj yog rau cov duab kos duab lossis cov kab zoo, thaum qee tus neeg yuav nyiam qhov kev xav thiab kev ntxhib los mos ntawm cov chalk.
Erasability: Ob qho kev xaiv yog erasable, tab sis kua chalk markers yuav xav tau tsawg zog los so tawm piv rau ib txwm chalk, uas yuav ua tau ntau plua plav.
Nto: Xyuas kom meej tias koj cov ntaub ntawv dub yog ua los ntawm cov khoom uas tsis yog ntxeem tau (xws li, plooj (porcelain) los yog iav) yog tias koj npaj yuav siv cov kua chalk markers.
