Do orange African violets exist?

I've seen red,yellow, green,blue,purple,pink,black, and white, but never orange. If red and yellow exist why not orange?

So far there are no orange.I don't know why,except maybe the red and yellow are both recessive.

Also there are very few yellow. Most are just like a tint of yellow. I've seen a Russian violet that was real yellow like a lemon. Don't know for sure if it was real or photoshopped. It was a beauty!!!