Is yours a 2004 or a 2003?
Reason I ask is that I broke my passenger mirror time back (my fault) and found a junk-yard replacement on-line that I got painted silver (on the outside, of course!

) and installed.
After installation, I noticed that the replacement passenger mirror was mildly bluish in its reflection. Different from my driver's side mirror ...
clearly different albeit minor, so I have always thought that it came from a 2004 rather than a 2003 (my model year).
I don't think this is an after-market applied color - it may just be that the 2004 was color'ed different right from Infiniti? This is a SWAG, of course.
Regardless, I have to admit that I have not worried about multiple images showing up. I will do a check some late evening ...
Now, on your specific issue: I have no idea is there is a tint to remove - I will also check that on my 2003 and 2004 (right side) mirrors.
If you have access to a lab, then you might consider doing a front-silvering on it - this would definitely remove multiple images. BUT, I am not sure how this long this would survive in the long run ...!
Z