Indeed, this helped. Thanks.

For the record: in order to keep the position of the number in the footnote high, one has to use:

Hans van der Meer

On 06 Sep 2015, at 12:29, Pablo Rodriguez <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,