Electrostatic Detection Apparatus (ESDA) illustrated above, is used to produce a visible image of latent indentations which may have been made in the paper surface, from writings on previous overlying page/s. Writing on top page makes indentations on under-lying pages The procedure using ESDA to produce a visible image of the indentations involves: Humidify the questioned document … Continue reading Latent Handwriting Indentations