An unusual and fascinating colour to be found in a tube of oil paint.
It is a mid-tone warmish grey, the main benefit of this over a palette mixed grey is that it will be cleaner, and I can see it being useful in taking down the chroma a notch in skin tones and similarly with horizons in landscapes. Potentially it could be used a neutral priming ground.
It has greenish undertones, darker in value than unbleached titanium.
Pigment - Titanium Dioxide, PW6.1
Vehicle - Linseed Oil, Consistency - Buttery