Natasha Denona Swing (402M) is a warm plum with a pearl finish that is permanent in palette and retails for $29.00. In comparison, Urban Decay Backfire (Afterdark) is a warm plum with a frost finish that is permanent in palette and retails for $19.00.
Urban Decay Backfire (Afterdark) is 90% similar — it is more shimmery, lighter, cooler.
