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Photographs can be used in collage in various ways...
Color copy an old photograph (sepia) and then attach it to your piece. You can do various things to it to give it an authentic look:- brush it with tea/coffee; rip the edges; stamp words across it with sepia colored ink...
If you don't have an old sepia photograph, then copy an old photograph in black and white and stain it with tea or coffee to give it the sepia look. You could also brayer a sepia colored ink across the image, or try one of the shadow inks available.