Too Faced Sequin is a cool teal with a frost finish that is limited edition and retails for $16.00. In comparison, Natasha Denona Deep Teal (19M) is a cool teal with a metallic finish that is permanent in palette and retails for $29.00.
Natasha Denona Deep Teal (19M) is 90% similar — it is more shimmery, lighter.
