Blacks shifting to greenish under daylight?

[Ink stained Fingers]

Profiling standardizes the color output of a printer to particular rules but it is not the one-for-all fix for B/W prints. Your color perception of a print can vary with the color temperature of the ambient light - same for B/W or color prints, and that's the reason why profiling software allows you to enter such information for the creation of a profile - it makes a difference at overcast or sunny daylight or incandescant light or fluorescent light, D50 - daylight at 5000K is a kind of default, average , standard setting which yields good colors overall under a range of light conditions but not for the more critical ones like cool type neon tubes and other light conditions with a less continuous spectrum. So it all depends - on you - how critical you are - how much you are willing to invest, and you may consider other people as well who look at your your prints and may be less sensitive.
Profiling compensates as well some base color tint you get with your paper - no paper is neutral white.

 

[MichaelKnight]

Thanks for your answers.