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A senate committee on nutrition has concluded three days of heard on food safety. And the committee was told, among other things, that many food dyes are a fraud on consumers and may even be a health hazard. A scientist said the use of artificial coloring in foods has jumped from 250 thousand pounds in 1940 to more than four million pounds last year. A biologist said bakers used yellow dye kn in something called egg bread to make it look like it contains more egg yolk than it really does. And he said gray-colored hotgogs are sometimes dyed red on the outside and pink on the inside to make them