Rose Madder Genuine versus Quinachridone Red Oil Paint

Here's a bit of information I found interesting, while comparing my own tubes of colors for this painting.
The Flower Chair background rose color is Daler and Rowney Oil Colour, Rose Madder (Quinacridone).

 "The term Rose Madder is most commonly used to describe the colour made from the Madder Lake pigment which is a traditional lake pigment extracted from the roots of the common madder plant Rubia tinctorum." This and more detailed history on this romantic color at: Winsor Newton Spotlight on Colour: Rose Madder Genuine

Left to Right:

Winsor Newton Artist Oil Colour, Rose Madder Genuine$21.50 for 37 ml (shown)
Daler and Rowney Oil Colour, Rose Madder (Quinacridone) $6.97, 75 ml tube (shown)
Gamblin Artist's Oil Colors, Quinacridone Red $4.77, 37 ml tube (shown).
 * Prices from Dickblick.com, as of 4/25/2020.
Quinacridone is sold is a less expensive substitute for rose madder, but there are differences in color. I will definitely keep all three, but if I want to cover a lot of canvas, I'll opt for the Daler and Rowney.
 
It's hard to discern the subtle color differences on screen, but to my eye, the Winsor Newton is the most beautiful and subtle, the Daler and Rowney a close second in terms of imitating the rose color of the Winsor Newton. 
The Gambin quinacridone red is a beautiful red in it's own right, but less of a match to the Winsor Newton. They all share a lovely transparency, which is why the white canvas shines through on the Flower Chair.