MAC Flesh Stone is a slightly warm-toned, light taupe with a matte finish. It is a limited edition lipstick that retails for $21.00 and contains 0.17 oz.
MAC Flesh Stone Retro Matte Liquid Lipcolour ($21.00 for 0.17 fl. oz.) is a muted, medium taupe brown with neutral-to-warm undertones and a matte finish. It had nearly opaque color coverage in a single layer, and the color applied evenly on the lips. The consistency was thin without being watery, so it spread well but was still easy to work with. There was very slight "cracking" where the color pulled away at my deeper lip lines (center of my bottom lip). It lasted for six and a half hours and faded fairly evenly and did not flake away. The formula was drying over time, though.
The Retro Matte Liquid Lipcolour formula is supposed to be pigmented, last eight hours, and be "non-feathering." They are typically pigmented and long-wearing, but the quality of the formula is all over the place--some shades wear down evenly, aren't too drying, and apply well, while other shades are patchy, streaky, or prone to flaking (and also terribly drying!).
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
A lip colour that provides a splash of colour in a liquid-suede finish that lingers.