Is it possible to color the sharps (or flats) in a key signature using lilypond?

Notes can be individually colored:

\version "2.22.2"

\score {
  \relative {
 \key a \major 
 \omit Score.TimeSignature
 a b
 \override NoteHead #'color = #red

colored note

How about sharps in the key signature?

enter image description here

  • 1
    I think that if your goal is to create instructional music, it would be clearer to have arrows pointing at the items you're trying to emphasise. If a music symbol is coloured then you have to read it twice - first time to get the colour which has some significance that you're trying to emphasise, and a second time for its actual musical significance ("third sharp in the key signature is G#" or "don't forget to play me as C# rather than C natural" Commented Apr 29, 2022 at 11:48
  • 1
    I think it depends on context. In this case the examples will be close together with multiple key signatures, so arrows might clutter it. Below I've found a solution, not sure if the best one but it works.
    – Vlad
    Commented Apr 29, 2022 at 12:42

1 Answer 1

% Functions
prepare =  
{\omit Score.TimeSignature
 \omit Score.BarLine
 \omit NoteHead

color_it = \once \override Accidental.color = red
end_it = {g g \undo \omit Score.BarLine \bar "||"}

\score {
  \relative {\prepare 

enter image description here

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