Mac "Sandy B" lipstick is a midtone peach with a strong gold shimmer. This is a really nice lipstick for summer as it really brightens the face, it also looks great underneath a gloss. It is a frost lipstick but doesn't pull too metallic/unnatural on the face. I say it was semi opaque- the peach tone is slightly sheer but the gold sheen is pretty strong. It has a satin finish and lasts on me about 4 hours, but as it's not particularly hydrating I do prefer to use a balm beforehand. Like all Mac lipsticks it has a sweet vanilla scent but doesn't linger once applied.