[Chris Saper]

Richard and Alexandra,

Alexandra, I think you have posted one of the most succinct descriptions I've seen on the nature of grays and color temperatures.

I will also use a combination of complementary mixed grays ( based on Steven Quiller's comprehensive research), as well as the neutral grays. (Not to be redundant in the Department of the Redundancy Department).

I use a hybrid of neutrals somewhere between Daniel Greene's and Bill Whitaker's palettes:

A warm neutral: raw sienna and black, about 6:1

A cool neutral: Grumbacher's ( brand specific, it's cooler) raw umber

And a neutral neutral: Gamblin's Asphaltum

A little flake white will show the dramatic temperature differences each will yield.