I saw this video on Sephora awhile back:
And it inspired me to buy the green color corrector: Bright Future Color Corrector by Sephora for $14.
Using it is challenging, even with the video. Probably because I don’t have a liquid concealer or a setting powder, so I’ve just been trying to blend it in with my regular foundation. And it works. Sort of? I just don’t know how much it actually reduces redness. I’ve also been using an ELF yellow concealer under my eyes to offset the blue, which does work amazingly well.