MAC Quintessential is a very warm-toned, light-medium taupe with a frost finish. It is a limited edition eyeshadow that retails for $17.00 and contains 0.05 oz.
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Quintessential is described as a "dirty olive [with a Frost finish]." It's a golden brown with subtle, warm, olive undertones and a frosted sheen. It had good color payoff that went on smoothly. It was also buildable to a slightly richer, more intense color. It was very blendable. See swatches of all dupes / view dupes side-by-side.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
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M·A·C Eyeshadow is a highly pigmented powder formula that applies evenly and blends well. Suitable for use either wet or dry, it's available in a wide variety of textures and finishes.