Personally I use florescent orange on the front and a florescent green on the rear. It stands out like a sore thumb. Both my 1911 and my S&W 640 are painted. Both are my carry's. 640 as a bug.
I can give you the paint name and numbers if you like. It's just finger nail polish I got at Walgreens. I'd go after dark. They expect stuff like that at that time :-) Or get the wife or GF.
That is a super idea. My Range Officer (all of them) is a pain in low light to get the front sight into frame. I have used a drop of white paint on the blade and it helps but the offset colors might be even better. Not sure how the green would look. I do not want to loose any points on the old man card you know.