Tanning occurs when the skin produces pigment to protect itself from UV rays and permanent skin damage. In airbrush tanning, the tanning solution is applied by a technician using a compressor and airbrush. These tanning solutions contact the active ingredient DHA that reacts with the outer layer of skin to produce a bronzing effect, similar to what a traditional tan does. For most solutions, the color of the skin will continue to darken after initial application and the maximum color is reached within about 12-hour period. Solutions also have a bronzer that provides an immediate tan effect and help the technical to distinguish areas of the skin that have solution already applied. Majority of this bronzer will be washed off when showering after application.