1. Williamson Co. D.D. What is caramel color. Available from: http://caramel.com/what-is-caramel-color/.
2. Center for Science in the Public Interest. Petition to the U.S. Food and Drug Administration to bar the use of caramel colorings produced with ammonia and containing the carcinogens 2-methylimidazole and 4-methylimidazole. 2011 Feb 16. Available from: http://cspinet.org/new/pdf/caramelcoloring_petition.pdf.
3. Joint Expert Committee on Food Additives. Caramel coloring. Prepared at the 55th JECFA meeting (2000) and published in FNP 52 Add. 8 (2000).
4. American Beverage Association. Know your ingredients [Internet]. Washington (DC): American Beverage Association; 2012 [cited 2012 Apr 13]. Available from: http://www.ameribev.org/minisites/products/.
5. Williamson Co. D.D. Product specifications [Internet]. D.D. Williamson Co.; 2012 [cited 2012 Jan 29]. Available from: http://www.caramel.com/154-Product-Specifications.aspx