Does anyone know what the color "Quaker grey" is a combo of?

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Maybe these will help.

You can find info about Quaker gray stone here:
http://www.cagenweb.com/quarries/name_an...

ISCC-NBS Dictionary of Colo(u)r Names (1955):
http://tx4.us/nbs/nbs-q.htm

Colors (Q) Mapped to NBS/ISCC Centroids:
http://www.anthus.com/colors/colors_q.ht...