A dark green but not so dark that it registers as black. It is like liquid chlorophyll or, if you remember defying school teachers by putting green rather than blue or black ink you your Parker fountain pen… yeah, like that.
It is a great brown skin friendly colour and using my boss as a barometer, he did not made any comments (positive or negative) about it so it is clearly not too outrageous for the office.
Personally I prefer a round lid on my varnishes as I find application easier with it but that is just me. I’m also accustomed to a wider brush, but those are my only gripes. I have had this colour for a couple of years but I don’t return to it as often as I should.