If my pistol/revolvers did not have white dot sights/night sights,I painted the entire front blade/post with Testers gloss yellow. I tried red but it does not index (eyes pick up) as fast as the yellow for me. I use the Testers paint thinner on a Q tip to clean off any oil/dirt before I paint the blade/post. Been doing this for 50+ years.
Before anyone comments,I know night sights have only been around for 10+ years.

I agree with the above post that it is personal preference on color used and amount of the blade is covered.

Be SAFE and Shoot often!