So how much of each? Making Jane's Gold :-)
Here is the first mix - not enough PR101
So I added another small blob using the tip of a palette knife - you can see the small blob in the corner of the palette
So I added the third small blob amount again, stirred it well, and came out with a very close match, pictured on the left.
Here is my mix compared with the actual PO49 paint. I estimate it is 5 parts PY150:1 part PR101, but the different brands will be different thicknesses so there is no magic formula.
Other good Quin gold hue mixes are PY150 + PO48, PY129 + PBr7 and even PY97 as a base yellow colour.
To see my Jane's Grey custom mix, click here
For Jane's Black and other custom mixes click here
For more custom mixes (Jane's golden Earth, Jane's Sienna and Jane's Earth Rose) click here.