Indeed, this helped. Thanks.

For the record: in order to keep the position of the number in the footnote high, one has to use:
\def\redfootnotenumber#1{\color[red]{\high{#1}}}
\setupnotation[footnote][numbercommand=\redfootnotenumber]

Hans van der Meer


On 06 Sep 2015, at 12:29, Pablo Rodriguez <oinos@gmx.es<mailto:oinos@gmx.es>> wrote:

this setup works fine in MkIV:

 \setupnote[footnote][textcolor=blue]

 \setupnotation[footnote][numbercommand={\color[red]}, color=green]


I hope it helps,