Originally Posted by HaintBlue
The biggest problem I see with this is that transparent yellows are strangely somewhere between rare and nonexistent. I have about a dozen (or more) tubes of various yellow paints and not a single one is transparent.
Lots of transparent blues, reds, browns, greens...but no yellow.
Winsor Newton offers Transparent Yellow 653 (PY128), that is a very transparent, primary Yellow. If you can't obtain that, I believe Rembrandt also offers a transparent Yellow of the same pigment ID.
Most any brand of Indian Yellow is transparent, and rather than being a primary Yellow, it has a bias toward Red. (It's an Orangey Yellow.)