No doubt the world would be a considerably duller place without artificial food coloring. But might it also be a safer place? The Center for Science in the Public Interest, an advocacy group, asked the government last week to ban artificial coloring because the dyes that are used in some foods might worsen hyperactivity in some children.

“These dyes have no purpose whatsoever other than to sell junk food,” Marion Nestle, a professor of nutrition, food studies and public health at New York University.

A government advisory panel concluded that there was no proof that dyes caused problems in most children, and that whatever problems they might cause in some children did not warrant a ban or a warning label beyond what is already required — a disclosure on the product label that artificial colors are present.

“Color is such a crucial part of the eating experience that banning dyes would take much of the pleasure out of life,” said Kantha Shelke, a food chemist and spokeswoman for the Institute of Food Technologists. “Would we really want to ban everything when only a small percentage of us are sensitive?” Indeed, color often defines flavor in taste tests. When tasteless yellow coloring is added to vanilla pudding, consumers say it tastes like banana or lemon pudding. And when mango or lemon flavoring is added to white pudding, most consumers say that it tastes like vanilla pudding. Color creates a psychological expectation for a certain flavor that is often impossible to dislodge, Dr. Shelke said.