YSL Wet Blue (10) is a very cool-toned, light blue with a metallic finish. It is a permanent eyeshadow that retails for $30.00 and contains 0.15 oz.
YSL Wet Blue (10) Full Metal Shadow ($30.00 for 0.15 fl. oz.) is a muted, medium-dark blue with a silver-ish sheen and overall frosted finish. It had more opaque color coverage if you can manage to apply with your fingertip just-so, but in practice, I found it difficult to really get consistently opaque, even color--especially when blending, it seemed to flake off as it dried down fairly quickly. It started to crease and flake after eight hours (not even close to the 16-hour wear it is marketed as!). See comparison swatches / compare dupes side-by-side.
Yves Saint Laurent Full Metal Shadow is the brand's first metallic-color liquid eyeshadow. Its pigment-packed formula lasts up to 16 hours without creasing, flaking or fading and contains 40% water for a cooling effect and pure color payoff. An exclusive applicator allows you to create three signature looks, including a full lid, just the line or a graphic eye.