Development of a fast analytical method for the determination of sudan dyes in chili- and curry-containing foodstuffs by high-performance liquid chromatography-photodiode array detection, Cornet, V., Govaert Y., Moens G.F., Van Loco Joris, and Degroodt J-M , J.Agric.Food Chem., 13/1/2006, Volume 54, Issue 3, Number 644, p.639 - 644, (2006)