Evidence supplied by traditional photography is admissible to the courts so long as it is authenticated and date stamped. This accepted form of evidence is, and must also provide proof of authentication and meeting protocol.

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The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips. 

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