This self-tanning spray colors the skin the same way as UV radiation, but then in a healthy way. The bronzing is absorbed into the skin and improves the melanin (pigment) causing the skin to turn brown. After spraying the color develops over a period of 6-8 hours and remains on your skin for 5-7 days. Solaris Instant Spray Tan does not contain Carotene (the cause of an orange glow). Get a smooth healthy glow instantly.