Some believe that these common food, drug and cosmetic dyes can exacerbate behavioral disorders in children, as well as possibly contribute to allergies and cancers.

The FDA, after long stating that no scientific evidence conclusively links the petroleum-based colorants to hyperactivity and other ills, has agreed to reassess them. A panel of experts will review studies and suggest any policy changes.

An outright ban on synthetic dyes is unlikely, though the nonprofit Center for Science in the Public Interest just petitioned the FDA to outlaw caramel colorings that use ammonium compounds, and in 2008 asked it to revoke approval for several synthetic food dyes.

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