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Daguerrotype or Ambrotype? So hard to choose…
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In 1862, S.J.Thompson & Co. was making photographs, daguerreotypes, and ambrotypes at 478 Broadway, in a now-lost building somewhere on the north side between State Street and Maiden Lane. Daguerrotype was the first commercial photographic process. Ambrotype was a positive image on glass, using a collodion solution (and such collodion, it is said, played…