Determination of the degree of reductive damage of hair with nir spectroscopy

An arrangement for determining a reductive damage of hair, comprising:

• a detection unit for detecting hair characteristics thereby generating detected hair characteristics;
• and
• an evaluation unit for evaluating the detected hair characteristics and for determining the reductive damage of hair based on the detected hair characteristics;
• wherein the detection unit includes a near infrared sensor, NIRS;
• wherein the detection unit is configured to irradiate a hair sample with electromagnetic waves in the near infrared region at a wavelength of from about 800 to about 2500 nm and to detect light emitted from the hair sample;
• wherein the detection unit is configured to generate a spectrum of the emitted light and to provide the spectrum to the evaluation unit;
• and
• wherein the evaluation unit is configured to determine a reductive damage based on the spectrum of the emitted light in a wavelength range of from about 1970 to about 1980 nm.