carbon copy(n = noun.artifact) carbon - a copy made with carbon paper;
is a kind of copy

activated carbon, carbon, carbon 14, carbon arc, carbon arc lamp, carbon atom, carbon black, carbon cycle, carbon dating, carbon dichloride, carbon dioxide, carbon dioxide acidosis, carbon disulfide, carbon monoxide, carbon monoxide gas, carbon monoxide poisoning, carbon nanotube, carbon paper, carbon process, carbon steel, carbon tet, carbon tetrachloride, carbon tetrahalide, carbon transmitter, copy, copy cat, copy editing, copy editor, copy out, draft copy, fair copy, hard copy, master copy, prompt copy, review copy, soft copy, test copy, write copy, xerox copy