I think this issue of course is the biggest one with sunless tanning besides the tan not lasting long enough.
I have had many new clients tell me "but I don't want to look orange?!" This I totally understand and I always try to help you understand it as well and what the causes of this NOT so pretty problem with sunless tanning.
The 2 biggest reasons you turn orange are...
1. Going to dark for your skin tone will just plain look fake and orange on you. The goal should always be to look like you but even prettier...Period. I think to leave people guessing as to what you did is my biggest compliment to my skills. I have lots of clients who tell me they are so surprised at how natural they look compared to last experience.
2. Being sprayed heavily can turn you orange as well, your skin can only absorb so much and excess solution is just not a good combo. Not to mention bad fading and IF you have gone to dark as well then can you say...spotted ooompa loompa? eeek!
Your artist should always consult with you and your desired result so that you do not have an Orange look to your skin tone. hope this helps you understand a little about the Orange Factor in sunless tanning! Cheers!