Color(s) Added This term is usually followed by a specific color that the food item contains. It can be naturally derived food coloring or artificial depending on the manufacturer. Natural dyes are extracts that are plant based, while artificial dyes are petroleum based. "U.S. Still Using Toxic Dyes Left Out of U.K. Goods." Health Freedom Alliance. 14 Mar. 2011. Web. 16 May 2011. <http://healthfreedoms.org/2011/03/14/u-s-still-using-toxic-dyes-left-out-of-u-k-goods-2/>.