The FDA knew long ago that red dye No. 3 causes cancer. Why did it take so long to ban it?
Briefly

The FDA's ban on red dye No. 3, stemming from evidence of its cancer-causing potential in animals, highlights concerns over food additives long considered safe.
Despite animal studies indicating risks, the FDA believes human exposure levels to red dye No. 3 are too low to pose a cancer threat, provoking ongoing debate.
Read at Los Angeles Times
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