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The purpose of any photo-thermal treatment is to raise the temperature of the target to a critical level, usually about 70°C, while making sure the surrounding tissue, and in particular the epidermal melanin layer, stays at a safe level (usually less than 45-50°C). The majority of any visible light which falls on skin tissue is absorbed by the melanin in the epidermis, the melanin in the hair shaft and red blood cells (red blood cells absorb mainly blue, yellow and green light).
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