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Sheffield Plate and Daguerreotype



Hi all:
 
Two questions:
 
+ The current clad plate for Daguerreotypes and  old Sheffield plate (invention by Thomas Boulsover c. 1743) are the same?.
 
+ What is the best for Daguerreotypes, clad plate or electroplate silver/copper?
 
Thanks. Best regards,
 
Manuel Estebanez
Spain