According to What is Carbro (emphasis mine):
'The word "carbro" is a combination of the first syllables of "carbon" and "bromide", and the process is so named because it is a method whereby a true carbon print can be made from a bromide print... the sensitized carbon tissue, instead of being dried and printed under a negative, is squeegeed into contact with a bromide print while still wet, the gelatin becoming insoluble not through the action of light on the sensitizer but through the chemical reaction between the sensitizer and the silver of the bromide print. Stripping and development follow in much the same manner as with carbon, the final result being an actual carbon print...'
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