Some of Rhine's most dramatic early experiments used badly printed Zener cards that allowed the symbols to show faintly on the back.

Name: Some of Rhine's most dramatic early experiments used badly printed Zener cards that allowed the symbols to show faintly on the back.
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Rhine's early experiments did use badly printed Zener cards that allowed the symbols to show faintly on the back, which contributed to criticisms of his methods.

Some of Rhine's Most Dramatic Early Experiments Used Badly Printed