METHOD OF DATING MANUSCRIPTS Russian patent published in 2012 - IPC G01N21/33 

FIELD: physics.

SUBSTANCE: three samples of a letter are obtained and analysed, one of which is extracted with a solvent and subjected to UV spectrophotometry right away; the second is analysed 30 days layer; the third is analysed 60 days after analysing the first sample; the second and third samples are extracted and subjected to UV spectrophotometry in the same conditions as the first sample; quantitative comparison of the results of UV spectrophotometry of the three samples is carried out based on the ratio of optical densities in the region of peaks (330-1100 nm) of dyes per unit length of the line of each sample in intervals of 1 and 2 months to obtain the behaviour of ageing of the manuscript, wherein ageing takes place in "natural" conditions with optimally permissible temperature, relative humidity and air speed in accordance with GOST 30494-96.

EFFECT: simplicity, high accuracy, guaranteed reproducibility and high reliability of determining ageing.

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