color change working in only upper staff

[Jim Cline]

I want to change the fingering color to red in my piano score.
Using
upper = \relative c'' {
   \override Fingering.color = #red

for the upper staff works, but adding the same for the lower staff

lower = \relative c {
  \override Fingering.color = #red

leaves the fingering in black in the lower staff.  The compiler gives no 
error message about it.  I tried commenting out the first override to see 
if that has some effect on the second one, but no.