MAC RiRi Woo Lipstick ($15.00 for 0.10 oz.) is described as a “matte cool red [with a retro matte finish].” It’s a deep, medium-dark red with strong cool undertones and a matte finish. MAC Ruby Woo is absolutely similar–it’s very, very similar. RiRi Woo is inspired by Ruby Woo, but the difference is very slight–there’s a noticeable difference in darkness and undertone when the two are swatched side-by-side, but applied, it is incredibly difficult to tell.
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