Purple actually produces the least amount of glare of any of our peep sights. Blue and black have nearly the same amount of glare. However, the eye seems not to mind the glare from blue as much as is does from Red, Green, Pink or even Black. So if you are being irritated by peep glare often times blue will reduce the amount of irritation. On target peeps the Black Oxide type of finish on Specialty Archery's replaceable apertures can reduce irritation too. So does applying burnt cork to any peep. Berchwood Casey's Sight Black works great, but it can get messy and needs reapplication regularly.