ColourPop Gone Galactic is a warm brown with a metallic finish that is limited edition and retails for $4.50. In comparison, Natasha Denona Sienna (50M) is a warm brown with a metallic finish that is permanent and retails for $29.00.
Natasha Denona Sienna (50M) is 90% similar — it is less shimmery, lighter, cooler.
