Discussion
ESDA stands for :
Answer: B
ESDA stands for Electrostatic Detection Apparatus.
The ESDA reveals indented writing, the impressions left on a sheet that lay under the page being written on. The document is covered with a thin plastic film and charged with a corona wand, and toner applied to the film collects in the indentations, making the invisible writing readable. It is a standard instrument in questioned document examination.
The other expansions are invented. The instrument does not detect alterations as such; it detects indentations through electrostatic charge.
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