carbro
/ˈkɑːbrəʊ/Photography. Now chiefly historical
noun
A variant of the carbon process in which a sensitized gelatin sheet bearing carbon or a coloured pigment is placed in direct contact with a bromide print to produce a monochrome image (either black and white or coloured). Frequently attributive in carbro print, carbro process, etc.
Origin
Early 20th century. From car- + bro-.