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Bingham & Hilliard (Memphis, Tennessee)
A comparative Pepsin experiment
n.d.
Cabinet card
Larry Gottheim, Be-hold, Inc
Photographs: Cabinet Cards & some Civil War, 29 October 2016, Lot 530
LL/69690
This is a rare example of a cabinet card giving scientific evidence. The bottles contain mixtures including four brands or types of pepsin. The photograph includes the hand-written protocol that is beneath the bottles.
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LuminousLint 
@LuminousLint