1. A method of validating biometric capture, in particular body print capture from an area of the body, in particular a fingerprint or face print, of an individual, wherein, in the area of the body provided with the biometric characteristic to be detected, the method comprising: illuminating said area of the body using at least a radiation including at least two different respective wavelengths between about 500 nm and 1150 nm, carrying out at least two reflectometry measurements in relation to said at least two different respective wavelengths between about 500 nm and 1150 nm, wherein it comprises the following steps measuring a first reflection rate of the tissues of said body area at a first wavelength, said first reflection rate being the reflected power divided by the incident power, measuring a second reflection rate of the tissues of said body area at a second wavelength, said second reflection rate being the reflected power divided by the incident power, calculating the ratio of the first reflection rate and the second reflection rate, and comparing the calculated ratio with an interval of reference values of the proportion of oxygenated hemoglobin relative to the deoxygenated hemoglobin, said interval of reference values characterizing a living tissue for the wavelengths of said radiation with which said area of the body has been illuminated, whereby, if said calculated ratio is within said interval, said area of the body is considered to be living and the biometric capture can be validated, or, if said calculated ratio is not within said interval, said area of the body is considered not to be living and the biometric capture may not be validated.