Inclusion Criteria:  Healthy female or male volunteer; from 18 to 40 years old; uniform skin color all over on the investigational zones; skin type III or IV according to the Fitzpatrick classification; ITA° between 10° and 35° at screening visit with an authorize delta of ± 2° at inclusion visit (D1) (Individual Typologic Angle calculated value); female of childbearing age using a reliable mean of contraception (for at least three month before the beginning of the study, and throughout the study); informed about the study objectives and procedures, and able to understand them; willing and able to fulfill the study requirements and schedule. All subjects will have to give their written informed consent  Exclusion Criteria:  Female in pregnancy (positive pregnancy-test performed before inclusion) or lactation or without effective contraception ; having planned U.V. exposure of the investigational zones (sunlight or sunbeds) throughout the study; having used sunbed or sun exposure of the investigational zones within the 3 months before inclusion; having sunburn (erythema) on the back; dermatological disorders affecting the investigational zones (presence of naevi, freckles, excess hair or uneven skin tones, vitiligo, photo-dermatological problems); history of skin cancer; history of abnormal response to sun; presence of recent suntan (according to Investigator opinion) or photo-test marks; history of allergy, hypersensitivity, or any serious reaction to any cosmetic product; any concomitant medical condition that may interfere with the study conduct in the opinion of the investigator; having used within the month before inclusion any systemic medication for more than 5 consecutive days (e.g. steroidal and non-steroidal anti-inflammatory drugs, insulin, antihistamines, antihypertensive, antibiotics -e.g. quinolone, tetracycline, thiazides, fluoroquinolones-), or any medication known to cause abnormal responses to U.V. exposure (e.g. vitamin A derivatives, psoralen, aminolevulinic acid derivatives, etc.), or having planned to use these medications during the study; having used within the 3 months before inclusion any depigmenting / whitening or propigmenting topical treatments, or any systemic treatment that would interfere with the study assessments (anti-inflammatory drugs, corticoids, retinoids, hydroquinone, etc.); unable to be contacted by phone in case of emergency; having participated within the 30 days before inclusion or currently participating in another clinical study. Deprived of liberty by adjunction or by official decision.