Which natural food coloring ingredient, used in Kellogg's Fruit Loops cereal in 2015, was recalled after consumers reported it caused temporary tongue discoloration?

Behind every successful food brand is a carefully crafted visual identity. Colors in food packaging aren't random - they're strategic choices designed to evoke specific emotions and associations. This poll tests your knowledge about a fascinating product recall that happened due to an unexpected reaction to a natural food coloring used in a popular breakfast cereal. How well do you know your food industry trivia?

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Spirulina extract (blue-green algae)
Beetroot extract (Beta vulgaris)
Turmeric oleoresin (Curcuma longa)
Annatto extract (Bixa orellana)