Deborah Luster: Helping prisoners show themselves to the world

Photographer Deborah Luster discusses a few examples of the more than 25,000 portraits she created as part of "One Big Self: Prisoners of Louisiana" (1998-2002). See more videos at www.sfmoma.org/video

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Anyone any idea of the techniques she uses as it's described as Liquid emulsion - is this basic liquid emulsion or is it tin types or collodian?