MAC Blue Peep is a neutral-toned, medium blue with a matte finish. It is a permanent eyeliner that retails for $16.00 and contains 0.1 oz.
Blue Peep is described as a "turquoise blue." It's a brightened, muted, medium blue with almost "warm" undertones--there's a teal vibe, but it is bluer than green. It had an ultra matte finish. The liner went only with mostly opaque coverage in one pass and lasted for the full ten hours I wore it for. Get comparison swatches / compare dupes side-by-side.