The mix has been used by other artists since Payne's time. The first recorded use of Payne's gray as a color name was in 1835.
Kyle Meredith With
Paynes Gray (mixed color) - Erik Lundgren Watercolor
Watercolor Pigments and Palettes: A Starting Selection – Right Reading
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Kyle Meredith With
How I mix neutral colors - Erik Lundgren Watercolor
Three primary colors An exercise - Erik Lundgren Watercolor
Exercise Reeds - Erik Lundgren Watercolor
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Paynes Gray (mixed color) - Erik Lundgren Watercolor