Tartrazine
Tartrazine, FD&C Yellow no 5, is the food colour that has been most implicated in causing adverse reactions.
The Tartrazine E-booklet provides you with a comprehensive summary of the research and problems linked with Tartrazine allergy/sensitivity.
The format is pdf and it is now available free: Tartrazine
Further information on how food additives can impact health can be found in The Food Intolerance Handbook.