> Where there is a perfect unison across two voices on a note outside
> the key signature, LilyPond engraves the natural sign twice,
> creating a bold appearance.
Nope, the positions fit exactly. I thus believe...
> This bold or “double-printed” accidental looks a bit strange to my
> eye. Is it best engraving practice?
... it's rather a problem of your PDF viewer if it disturbs the eye
too much. See attached image of `evince` on my GNU/Linux box.
`okular` returns the same rendering.
On the other hand: I agree that accidentals that overlap exactly
should be printed only once. I can't find an issue in our bug tracker
for this problem, so please open a new issue.
Werner
