xaum tawv tawvyog siv rau kev kos duab, teeb pom kev zoo, thiab kos duab uas xav tau qib siab ntawm qhov raug. Cov hlau lead no yog siv rau kev kos duab, kos duab kos duab ua haujlwm, sau ntawv thiab cov hom phiaj dav dav. … Ntoo-cased cwj mem tuaj nyob rau hauv ntau yam sib txawv qhov hnyav, xws li 9H (nyuaj heev) txog 6B (mos heev).
Cov cwj mem dab tsi yog siv rau kev kos duab kos duab?
Graphite mem hluav(ib txwm hu ua "cov xaum") tsim cov cim grey lossis xim dub uas yooj yim tshem tawm, tab sis txwv tsis pub tiv taus cov dej noo, feem ntau cov tshuaj, hluav taws xob ultraviolet thiab ntuj aging.. Lwm hom cwj mem cores, xws li cov charcoal, feem ntau yog siv los kos duab thiab kos duab.
Puas xaum siv rau kev ua haujlwm dav dav hauv kev kos duab?
Teb: Ob txoj kev xaiv tseem ceeb uas koj muaj rau kev kos duab yog graphite thiab charcoal mem hluav. Kev piav qhia: Graphite mem hluav muaj ntau qib thiab muaj txiaj ntsig zoo rau cov duab kos duab uas xav tau kev nthuav dav zoo dua.
3H cwj mem siv yog dab tsi?
3H yog qhov ntxoov ntxoo heev ntawm grey uas tawm lub teeb heev rau ntawm daim ntawv. Nws tuaj yeem yog qhov kev xaiv zoo rau sketches qhov twg kojxav tau ntxiv cov duab ntxoov ntxoo lossis me ntsis sau rau hauv qhov chaw khoob nrog xaum.
Qhov twg tsaus 2B lossis 4B?
2B nyuaj dua 4B thiab 4B nyuaj dua 6B. Txawm li cas los xij, tag nrho cov no yog nyob ntawm qhov muagsab (B). Cov hauv qab no yog tus qauv ntsuas. Qhov nyuaj tshaj plaws yog sab laug, softest ntawm sab xis: 10H, 9H, 8H, 7H, 6H, 5H, 4H, 3H, 2H, H, F, HB, B, 2B, 3B, 4B, 5B, 6B, 7B, 8B, 8B, 10B.
