Ma'anar ƙamus na "black gubar" na iya bambanta dangane da mahallin. Anan ga wasu hanyoyi: Wani abu kuma da aka fi sani da graphite, wanda wani nau'i ne na carbon da ake amfani da shi a fensir da kuma man shafawa. A cikin wannan mahallin, galibi ana amfani da "black gubar" azaman madadin suna don graphite. aikace-aikacen masana'antu. A cikin wannan mahallin, "black gubar" na iya nufin musamman ga nau'in plumbago mai daraja. murhu. A cikin wannan mahallin, "black gubar" yana nufin cakuda graphite da sauran sinadaran. ana iya ɗaukan tsohon zamani ko kuma a ɓoye a wasu wuraren.