ColourPop On a Whimsy is a cool silver with a metallic finish that is permanent and retails for $4.50. In comparison, Dior Trompe L'Oeil (011) is a cool silver with a frost finish that is limited edition and retails for $31.00.
Dior Trompe L'Oeil (011) is 85% similar — it is less shimmery, lighter, cooler.
