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Bleuluxe #4 is a blackened navy blue with a pearly shimmer. It was sheer when applied dry, and it intensified to semi-opaque color when applied damp. Bobbi Brown Blue Onyx is darker. MAC Shop & Drop is darker. MAC Thru the Night is similar. MAC Blue Storm is lighter. Burberry Midnight Blue is lighter. Make Up For Ever #81 is bluer. See comparison swatches.
Looking for something similar or to see what you have in your stash? Here are some of the top dupes for this shade!