MAC Bossa Blue is a slightly warm-toned, dark taupe with a frost finish. It is a limited edition eyeshadow that retails for $21.00 and contains 0.06 oz.
Bossa Blue is described as a "royal blue with brown pearl." It's a warm-toned taupe--a grayish brown with a gray sheen. The texture was a bit dry and powdery, and the resulting payoff when applied dry was semi-sheer, while when applied damp, it was more semi-opaque. I found it fairly buildable on the lid, but it does need some layering. There's no shortage of shades like this, even with MAC's releases. MAC Pastelluxe #5 is warmer. Disney Midnight Hour #4 is darker. Urban Decay Mushroom is a cream product but similar in color. Urban Decay Armor is a touch darker. Urban Decay Mushroom is similar. NARS Grand Palais #1 is lighter. MAC Keep Your Cool is darker. MAC Twilight Falls is browner. Giorgio Armani #4 is more shimmery. See comparison swatches.
The Mineralize Eyeshadow formula is supposed to have "low-to-medium coverage" when applied dry and "more intense coverage and color" when used wet. Most shades have color payoff that is true to the brand's description: semi-sheer to semi-opaque when used dry and semi-opaque to opaque when used with a dampened brush. I tend to find that they apply more smoothly and evenly with a more metallic finish with a dampened brush as well. Some shades can be a little too dry or dusty and do not apply as well with a dry brush. The wear is typically a bit less than average on me--six to seven hours.