Guerlain Rose Barbare #5 is a very warm-toned, dark purple with a pearl finish. It is a discontinued eyeshadow.
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Rose Barbare #5 is a darker plum with warm undertones and a satin finish. It had sheer coverage, and a lot of that was due to the incredibly stiff, firmly pressed powder--it was hard to get any product off of the surface of the pan. Unsurprisingly, it blended terribly and applied unevenly (what little that made it). It showed signs of creasing after five hours of wear.
Looking for something similar or to see what you have in your stash? Here are some of the top dupes for this product!
These shades feature matte, satin, and metallic finishes and are enriched with light pigments, reflecting light to make the eyes seem more open and brighter.