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Reactions to food dyes are not IgE (true allergic type) reactions, so they are sometimes classified as food intolerances rather than food allergies. There are IgG tests that can determine sensitivity to food dyes, however most Board certified allergists don't find these evaluations helpful. Our own experience is that the IgG testing was valuable, and helped us to steer clear of any product with certain food dyes that caused reactions in our daughter.
