Tintype

"She pulled out the tintype. It was small, dark, and the portion of the image where she'd been posed was blurry. She was a young child when it'd been taken—she didn't remember exactly when—leaving her to assume she must have fidgeted sometime during its processing.  Being the sole image of Maeve and the only thing left of her family, the blur was disappointing.  But despite that, it remained one of her most prized possessions."

Details
A tintype, also known as a melainotype or ferrotype, is a photograph made by creating a direct positive on a thin sheet of metal coated with a dark lacquer or enamel and used as the support for the photographic emulsion. Tintypes enjoyed their widest use during the 1860s and 1870s, but lesser use of the medium persisted into the early 20th century.

Maeve MacKenna kept a tintype of her family in the pewter cauldron she hid under her bed at the Tiff and Tawny Saloon. It was one of few belongings she was able to retrieve from the train combines shortly after her parents, Colin and Ashling MacKenna, were murdered by Francisco Esquivar and the Shadow Wolf Pack.

She often though about adding the tintype to be displayed on the top of her dresser, but the pain of losing her only family was still too fresh.