FIELD: criminalistics; dactyloscopic examinations. SUBSTANCE: single-layer film is sprayed on trace accepting surface. Film thickness is from 0.1 to 0.2 mcm. Film is made of material having evaporation temperature from 1100 to 1300 C. This material does not contaminate vacuum system. Spraying is performed at rate of 10-100 
/s, and operating pressure is selected within 10-2-5•10-3 Pa. EFFECT: enhanced efficiency of detection. 1 cl, 1 dwg
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