Boy wearing a straw hat, about 1858
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A collodion positive (ambrotype) of a smartly-dressed boy wearing a straw hat, taken by J. Hickling in about 1858. 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.