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image appearing ‘negative’ on dagguerotype 
image transitioning from positive to negative 
female image of daguerrotype, on a card of tintype buttons
Background/Story
Rare, daguerreotype photograph buttons.
from Wikipedia on Daguerrotype: The image is on a mirror-like silver surface, normally kept under glass, and will appear either positive or negative, depending on the angle at which it is viewed, how it is lit and whether a light or dark background is being reflected in the metal.
See also Tintype buttons in our Button Album.
