Discussion
Indented writings on paper can be deciphered by ________.
Answer: B
Indented writings on paper can be deciphered by the Electrostatic Detection Apparatus, option (B), the ESDA, in which the paper is covered with a thin film, charged and dusted with toner so that the impressions left from the pen pressure on the sheet below show up. Electrophoresis separates charged molecules, electroplating coats a metal, and electrolysis splits compounds by current, so (A), (C) and (D) have no use in finding indentations.
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