Back in August, I reviewed Effetre 084 - Steel Grey - and remarked that it really isn't a neutral grey - more of a greenish grey.
In fact, if what you want is a purely neutral, middle-of-the-road grey - your colour of choice would be Effetre 048, Grey.
This pale, transparent grey is very much the neutral grey, neither shading to cool tones or to warm - which is to say, neither bluish nor brownish in hue.
It's really wonderfully clear too. I bet it etches nicely too.
And, of course, over white.
This is a nice choice for a sophisticated colour set that maintains a pure, neutral grey.