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2 091 767

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IPC

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Application

95111317/25, 1995-06-30

(22)

Actual filing date

1995-06-30

(45)

Published

1997-09-27

(72)

Inventor

Korolenko Igor' IvanovichMakhonin Igor' KonstantinovichSavel'Ev Jurij IvanovichSobolev Anatolij VladimirovichChebyshev Aleksandr Vasil'EvichShtapov Vladimir SergeevichShumilkin Aleksandr Vladimirovich

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Holder

METHOD OF ESTABLISHING AGE OF HAND-MADE IMAGES Russian patent published in 1997 - IPC

Abstract RU 2091767 C1

FIELD: forensic chemistry. SUBSTANCE: invention relates to investigation of documents made by ball-point paste containing resins and triarylmethane dyes. Specimen with image is treated at least twice with air flow containing treating agent vapor in quantity at least 5.10^-7 g/l. At least two dependencies in the form of S-shaped curves characterizing change in image color are plotted. These are derived from dependence of reflected light intensity on specimen treatment time caused by saturation of ball-point paste image with piperidine vapor. Measuring characteristics of curves allows determining age of hand-made image using empirical formula with accuracy 25%. EFFECT: increased accuracy of determination. 1 dwg

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RU 2 091 767 C1

Authors

Korolenko Igor' Ivanovich

Makhonin Igor' Konstantinovich

Savel'Ev Jurij Ivanovich

Sobolev Anatolij Vladimirovich

Chebyshev Aleksandr Vasil'Evich

Shtapov Vladimir Sergeevich

Shumilkin Aleksandr Vladimirovich

Dates

1997-09-27—Published

1995-06-30—Filed