\setuphead[chapter]
[
style={\tfd},
color={A2plus},
]
\setuphead[section]
[
style={\tfc},
color={A3plus},
]
\definecolor[A1plus][h=5CAF00]
\definecolor[A2plus][h=B6437E]
\definecolor[A3plus][h=606ABD]
\definecolor[A4plus][h=FFC700]
\definecolor[A5plus][h=D0202B]
\definecolor[A6plus][h=EF8600]
\definecolor[A7plus][h=0082AA]
\setupcolors[textcolor=A1plus]
\usemodule[tikz]
\starttext
\startchapter[title={Colour test}, ref=colourtest]
\startsection[title={Section}]
\starttikzpicture
\draw[text=A6plus] (0,0) rectangle (2,1) node[right] {node text should be orange};
\stoptikzpicture
\par This a paragraph which gets the colour of the section for no reason.
\stopsection
\stopchapter
\startchapter[title={Colour test 2}, ref=colourtest]
\startsection[title={Another section }]
\par This a paragraph in the appropriate text color (green).
\starttikzpicture
\draw[text=A6plus] (0,0) rectangle (2,1) node[right] {node text is orange};
\stoptikzpicture
\stopsection
\stopchapter
\stoptext