Mussini Naples Yellow Light, Opaque.
I haven't been using true antimony Naples Yellow which is a lot denser and more expensive than this compounded color. This does the job. If I had the money to spare I would jump on the Antimony!
It is permanent and opaque.
I do carry both the light and dark Naples Yellow and depending on the scene which to use is decided.
Find this color on a real color wheel.