How does a tanning mist work?

I am an airbrush artist in New Jersey for Beach Bum tanning, a chain on the East Coast. Airbrushing is a form of tanning that is used instead of using tanning beds that are seen as unhealthy. We use solution, provided by our company where we evaluate your skin tone when you come in, and you tell us the look you are looking for and we make that happen. We use all organic/healthy solution which is good for you skin and comes out of clothes. I begin with your back, turning your body as you go getting into places a spray machine (that usually comes out orange) can't get to. This also gives you a choice in color instead of just one that would spray out at you. It never globs or gets smudged either because we are using air as we go along. Also unlike the machine, airbrushing is more browning unlike the machines or self tanners. I usually reccomend this for people who have important events, want a healthy solution or have such fair skin that they don't want to risk orange color from self-tanning or the machine. It usually can last two weeks if taken care of by moisterizing and washing with lotion/soap that has no sulfates - so always check your ingrediants.