Sadly, these pictures are not exactly true to colour. My camera captures this colour as more of a cool-toned blue. However, in real life, I would describe Slapper to be a true teal/turquoise - a green toned blue. It is more green than OPI's Fly and very similar to American Apparel's ------ as well as Urban Outfitters Green #9.
What do you think? Have you tried Butter London?