"
Carbon" is used here as a description. It means something that is absolutely 100% exact of another. Not similar, not related, not sort of like,
neat a cheap copy but absolutely the same. Down to the
carbon molecules. A
carbon copy if you will.
"Henna, do you remember that key you gave me the other day to access
the locked cabinet in Mr.
Senner's office ?"
"Yeah, I do."
"Opening it I found a copy of the key sitting on the bottom. Carbon."
"
That's strange. There's only supposed to be one. What good does it do in there ?"