Ambrotypes (circa 1854)The ambrotype was a glass negative backed with black material, which enabled it to appear as a positive image. Patented in 1854, the ambrotype was made, packaged, and sold in portrait studios as the daguerreotype had been, but at a lower cost. The ambrotype produced a single image on glass. They replaced daguerreotypes From My Collection6th plate Ambrotype 1861
9th plate Ambrotype 1858
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