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National Gallery of Art Acquires 21st Collection@NationalGallery ?#21stcollection #platinumprint #silvergelatin #photogravure #luminogram #ambrotype #tintype #dyesublimation https://t.co/6Ue1WEw3C4
What is a Luminogram @MikeGJackson #luminogram #platinumprint https://t.co/14sEfCizDb