Cov ntawv tsis muaj cov ntawv carbonless, sab pem hauv ntej ntawm daim ntawv sab saud tuaj yeem kov sab pem hauv ntej ntawm daim ntawv nruab nrab thiab sab pem hauv ntej ntawm daim ntawv qis tuaj yeem luam tau, ob daim ntawv sab saud lossis ob daim ntawv qis tsis tuaj yeem tsim cov ntawv luam tawm.
Cov ntawv tsis muaj cov pa roj carbon tsis tas yuav tsum siv cov ntawv siv cov pa roj carbon monoxide, thiab nws tuaj yeem luam tawm yam tsis muaj cov pa roj carbon monoxide, vim tias nws yog coated nrog cov tshuaj. Ntau nplooj ntawv ntawm cov ntawv tsis muaj carbon yog muab tso ua ke los luam lossis sau ncaj qha los ua ntau cov ntawv luam. Nws yog ib qho yooj yim los ntxuav, thiab tseem tuaj yeem ua rau hauv perforated tsis muaj lub computer luam ntawv kom paub qhov nruam luam ntawv thiab luam tawm. Kev tsim cov ntawv carbonless ntawv hauv paus yog qhov tseem ceeb heev.