Discussion
To decipher indented writings, following instrument is used :
Answer: B
Indented writing, the impressions left on a sheet below the one written on, is made visible by the Electrostatic Detection Apparatus (ESDA), which uses a charged film and toner. A videospectral comparator examines inks, a universal projectina is an enlarging projector for documents, and the comparison microscope compares two specimens side by side. So ESDA is correct.
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