The effect of viewing an uncased Ambrotype against a dark and a light background. The dark background makes the image appear positive but an ambrotype is a negative image.
A Daguerreotype uses a highly polished metal plate to support the image. This makes the image difficult to see from certain angles and in certain types of lighting. Daguerreotypes are delightfully known as a "mirror with a memory".
Demonstration of how a type of deterioration in old photos, known as silvering, can be removed using polarising filters.
A quick look at the camera scanning set up I use to digitise old photos.
A talk about setting up a Permanent.org archive, which was presented as part of the "All About That Place" event in 2024.
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