[NTG-context] how to color footnote?

... while dealing with colored elements: having the footnote number (down in front of the footnote text) in dark green is not that bad, just, why can't it be colored in an other way? I tried in vain both in \setupfootnotes and \setupfootnotedefinition: numbercolor, color... Only \setupfootnotes[textcolor=magenta] affects the footnote number in the main text. But nothing changes in the footnote area. Does this make sense? Steffen