Art -- I'd recommend Blockx Gold Ochre over either the WN or OH versions.
Another wonderful color is Michael Harding's Yellow Ochre Deep.
Here is a sheet showing comparison between natural and synthetic YO in various mixes:
If you notice, the OH YO Light and the Mussini Attish Light Ochre look basically identical, leading me to believe that Mussini accidentally labeled this paint as synthetic ochre, but instead it is natural. Also note the difference in tinting strength between the natural and synthetic versions.
The next sheet shows various Blockx earth colors, including the Gold Ochre. I think you will see why I am recommending it. (The Naples Yellow is not genuine, but a mix of synthetic iron oxide, yellow and white).
Finally, this one shows the Blockx Gold Ochre next to the Harding Yellow Ochre Deep. (L to R): OH Naples Yellow Deep Extra (PBr24), Harding Naples Yellow (imitation -- PBr24), Blockx YO and Harding YO (both synthetic), Harding Yellow Ochre Deep, Blockx Gold Ochre and Blockx Brown Ochre.
