A collodion positive (ambrotype) of a seated woman holding a book, taken by an unknown photographer in about 1860. The woman rests her elbow on a table, her arm next to a vase of flowers. She is posed as if reading a book. The collodion positive process (also commonly known as ambrotype) was popular during the 1850s and 1860s. An underexposed collodion negative on glass was backed with a black opaque coating to create a unique positive image.
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