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The Daguerrotype plate was difficult and time consuming to make. A sheet
of copper was plated with a thin coat of silver. This was then
polished until the surface was mirror like.
The photograph surface was
very fragile. Daguerrotypes were typcally encased. The
picture usually had a brass 'mat' placed directly on the plate, and then
glass was placed over this, without touching the photographic plate.
Since the photograph is silver
on copper, it will not attract a magnet. Also, if the plate is
carefully removed from the case, you can see the copper on the back.
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