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Unidentified photographer/creator
An original bottle of "rotten stone" from the Daguerreian era.
n.d.
Bottle
Archives of Modern Conflict OR National Gallery of Canada
LL/9700
Note that on the label it specifically says that the contents are for "Daguerrean Purposes".
Rotten stone, or rottenstone, is soft material resulting from the decomposition of siliceous limestone and was used to scour and polish the surface of a plate to remove surface imperfections prior to taking the exposure.
Other materials used for polishing were rouge and chimney black (soot).
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LuminousLint 
@LuminousLint
