It has a yellowish-green color imparted by tartrazine. It is typically labelled on food packages as "color", "tartrazine", or "E102". It can also occur after bariatric surgery, mercury exposure and tartrazine. It can be combined with tartrazine (E102) to produce various shades of green. It can also occur after bariatric surgery, heavy metal exposure and tartrazine. Some include tartrazine in the allergens alert section. Tartrazine or sunset yellow have been used to colour counterfeit powdered saffron. Caramel and tartrazine are used to achieve Galliano's bright yellow colour. Tartrazine is listed as a permitted food coloring in Canada. The most common yellow food coloring in use today is called Tartrazine. Tartrazine is a synthetic lemon yellow azo dye primarily used as a food coloring. Tartrazine is water-soluble and has a maximum absorbance in an aqueous solution at 425 nm.