Guerlain Tonka Imperiale #4 is a slightly warm-toned, medium-dark brown with a satin finish. It is a discontinued eyeshadow.
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Looking for something similar or to see what you have in your stash? Here are some of the top dupes for this shade!
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.