MAC Blue Karma is a warm teal with a pearl finish that is limited edition and retails for $25.00. 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, brighter.
