Compositions and kits for custom coloration, device dispensing the same and methods thereof

A method of acquiring spectroscopic data from a plurality of aligned keratinous fibers defining an alignment axis and an azimuth reference plane that is the best plane defined by the keratinous fibers, the method comprising:

• a. illuminating the plurality of aligned keratinous fibers by measurement beam(s) of light;
• b. receiving light from the illuminated fiber(s) into a 1D or 2D array of photodetectors;
• c. determining an indication of an azimuth angle between the incoherent beam(s) of light and the aligned keratinous fibers;
• d. if the azimuth angle deviates from 0 degrees or 180 degrees by more than a threshold deviation angle, generating an alarm signal;
• and
• e. analyzing the output of photodetectors to determine spectroscopic data of the illuminated keratinous fibers.

A method of acquiring spectroscopic data from a plurality of aligned keratinous fibers defining an alignment axis and an azimuth reference plane that is the best plane defined by the keratinous fiber, the method comprising:

• a. illuminating the plurality of aligned keratinous fibers by beam(s) of light;
• b. receiving light from the illuminated fiber(s) into a 1D or 2D array of photodetectors;
• c. determining an indication of an azimuth angle between the incoherent beam(s) of light and the aligned keratinous fibers;
• d. analyzing the output of photodetectors to derive spectroscopic data of the illuminated keratinous fibers from (i) a zero-azimuth-illumination model of spectroscopic data describing a relation between detector output and spectroscopic data under ideal conditions where the measurement incoherent beam is incident upon the illuminated fiber(s) at zero azimuth;
• (ii) a spectroscopic data correction function describing corrections to the ideal-condition spectroscopic data at different non-zero azimuth angles;
• and (iii) the measured azimuth angle indication.