MAC Black Mirror is a neutral-toned, medium-dark black with a matte finish. It is a permanent eyeshadow that retails for $23.00 and contains 0.17 oz.
MAC Black Mirror Pro Longwear Paint Pot ($23.00 for 0.17 oz.) is a medium black with neutral undertones and a flat, matte finish. It had semi-opaque pigmentation that was buildable, but the texture was drier and stiffer to work with. I'd recommend using a synthetic brush to dig around and get product out, and then use a fingertip to soften the edges.
It would be easier to work with as an eyeliner or applied on the lid for a cut-crease look, as it was just difficult to diffuse the edges as it was almost set as soon as it was in contact with my skin. It wore well for 12 and a half hours before starting to fade slightly, though I didn't see creasing until after 15 hours of wear; not quite 24 hours, but it seemed like it would have visible product by the end of that time period.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
A highly pigmented, long-wearing, blendable eye primer and/or cream shadow – M·A·C Pro Longwear Paint Pot goes on creamy and dries to an intense, vibrant finish that lasts for 24 hours. The innovative second skin-like creamy shadow formula blends smoothly over lids and creates seamless, buildable coverage without looking heavy or cakey. Its superior colour purity stays true and will not streak or crease. Pro Longwear Paint Pot can be mixed with other products, like M·A·C shadows and liners.
Isododecane, Calcium Sodium Borosilicate, Dimethicone, Polyethylene, Hydrogenated Polyisobutene, Quaternium-90 Bentonite, Dimethicone Silylate, Silica, Octyldodecanol, Tocopheryl Acetate, Lecithin, Trihydroxystearin, Copernicia Cerifera (Carnauba) WaxCera CarnaubaCire De Carnauba, Propylene Carbonate, Triethoxycaprylylsilane, Tin Oxide, Calcium Aluminum Borosilicate, Pentaerythrityl Tetra-Di-T-Butyl Hydroxyhydrocinnamate, [+/- Mica, Titanium Dioxide (Ci 77891), Iron Oxides (Ci 77491, Ci 77492, Ci 77499), Aluminum Powder (Ci 77000), Bismuth Oxychloride (Ci 77163), Blue 1 Lake (Ci 42090), Bronze Powder (Ci 77400), Carmine (Ci 75470), Chromium Hydroxide Green (Ci 77289), Chromium Oxide Greens (Ci 77288), Ferric Ammonium Ferrocyanide (Ci 77510), Ferric Ferrocyanide (Ci 77510), Manganese Violet (Ci 77742), Ultramarines (Ci 77007), Yellow 5 Lake (Ci 19140)]
Disclaimer: Ingredient lists are as available by the brand (or retailer) at the time of publishing. Please always check product packaging, if it exists, for the ingredient list applicable to the product you're purchasing, or the brand or retailer's website for the most up-to-date ingredient list.