The ambrotype is developed directly on a plate of glass, not on silver-coated copper plate like the daguerreotype or the blackened-iron of the tintype.
Note: Don't mistake the reflection of the cover glass to be the mirror look.
If the image is out of the case, you will be able to confirm the nature of the photograph.
See the Photographers used many of the same pieces and methods for packaging an ambrotype as they did for the daguerreotype (see Daguerreotype page).
Nearly all ambrotypes will have a preserver (if the packaging is original).
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A lot of smokers face the problem of storing cigars without humidors.
Not only beginners, but also connoisseurs in this field have difficulties with cigars' storage.
Smooth or finely textured surfaces adorned mats up to about 1859. Then, intricate designs began appearing, stamped into very thin mats. Along with mat designs becoming more ornate, the preserver also became more intricate, and delicate.
Preservers before 1859 were usually plain along the edges, with a singular and simple design.
Even the softest camera lens brush will scratch the delicate surface.