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Claim A says Burger King's black bun once turned customers' poop green. Claim B says Burger King's black bun was colored with squid ink. Claim A is true, and Claim B is completely made up.
In late September 2015, Burger King announced the A.1. Halloween Whopper, a burger with a jet-black bun flavored with A.1. sauce. The chain had spent millions of dollars advertising it.
Within days, the complaints started. Tweets dated September 30 through October 5 described diners finding their bathroom visits suddenly turning a vivid green. Internet users dubbed it #GreenPoop, and news outlets piled on. One Maxim writer even reported his own green stool.
The likely culprit was the food coloring. Burger King's website listed dyes including Red #40 and Blue #1. A Burger King rep said the bun contained less than 1 percent food dye, and that the dyes were FDA approved.
Experts said the explanation was probably simple. Dye that isn't absorbed can tint what's in the gut, and a doctor noted that yellowish bile mixed with blue coloring likely makes an emerald green. Medical experts said it was nothing to worry about. Burger King never publicly confirmed the cause, though.
The brand pile-on was swift. On October 6, Charmin tweeted: "Whatever the color of your buns, we'll keep them clean."
As for Claim B, the American bun wasn't made with squid ink. Burger King's own ingredient list showed artificial food colorings. The squid-ink black burger was a separate product released in Japan.
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