carbon paper

US /ˈkɑːr.bən ˌpeɪ.pər/
UK /ˈkɑːr.bən ˌpeɪ.pər/
"carbon paper" picture
1.

papier węglowy, kalka

a thin paper coated with a waxy pigment, used for making a copy of a document as it is being written or typed

:
She used carbon paper to make a duplicate of the invoice.
Użyła papieru węglowego do wykonania duplikatu faktury.
Old typewriters often required carbon paper for copies.
Stare maszyny do pisania często wymagały papieru węglowego do kopii.