First among the accepted list is Blue No. 1, or Brilliant Blue FCF, which creates — as you might have guessed — a medium blue shade. This coloring was actually banned in Austria, Belgium, Denmark, France, Germany, Greece, Italy, Norway, Spain, Sweden, and Switzerland, but has since been let back into most of the countries under the European Union. Blue No. 1 can be found in some dairy products, sweets, and drinks. Blue No. 1 uses coal tar as one of its components. Because of the use of coal tar, many organizations and circles are speaking out and boycotting products using colors with coal tar because it is a carcinogenic in large quantities, known to cause tumors in lab rats.

Second is Blue No. 2, which is commonly added to tablets and capsules, but is also used in ice cream, sweets, baked goods, confectionery, and cookies. Also known as Indigotine, the color was extracted originally from several species of plant as well as one of the two famous Phoenician sea snails or from woad, but nearly all indigo dye produced today for food or textile is synthetic. It is possible to have an allergic to Blue No. 2.

Green No. 3, or Fast Green FCF, can be used for tinned green peas and other vegetables, jellies, sauces, fish, desserts, and dry bakery mixes at level of up to 100 mg/kg. Fast Green FCF produces a sea green. Green No. 3 is poorly absorbed by the intestines.

Red No. 40 was introduced as a replacement for Red No. 2 because Red No. 2, or Amaranth, was a suspected carcinogenic. It has the appearance of a dark red powder. Red No. 40 can be found in sweets, drinks and condiments, medications, and cosmetics. Despite the popular misconception, Allura Red AC is not derived from the cochineal insect. Red AC is derived from coal tar. Carmine (or Crimson Lake, Natural Red 4), however, is the coloring extracted from dried cochineal beetles. It is banned in Denmark, Belgium, France, Germany, Switzerland, Sweden, and Austria. It was once feared as a carcinogenic, but this has since been disproved. It has, however, caused allergic reactions in people as well as hyperactivity in children.

Also known as Erythrosine, Red No. 3 is a cherry-pink coal tar-based food dye. It is also used in printing inks, as a biological stain, a dental plaque disclosing agent and a radiopaque medium. It is used in cherries, canned fruit, custard mix, sweets, baked goods, and snack foods. It can cause sensitivity to light and learning difficulties, can increase thyroid hormone levels and lead to hyperthyroidism, and was shown to cause thyroid cancer in rats in a study in 1990.

Yellow No. 5, or Tartrazine, is used for yellow coloring, but can also be used with Brilliant Blue FCF or Green S to produce various green shades. Use of tartrazine is banned in Norway and was banned in Austria and Germany, before European Parliament lifted the ban. Yellow No. 5 can be found in soft drinks, instant puddings, flavored chips (Doritos, etc), cake mixes, custard powder, soups, sauces, kool-aid, ice cream, ice lollies, candy, chewing gum, marzipan, jam, jelly, marmalade, mustard, horseradish, yogurt, noodles, pickles and other pickled products, certain brands of fruit squash, fruit cordial, chips, tim tams, and many convenience foods together with glycerin, lemon and honey products.

Also known as Sunset Yellow FCF, this dye is an orange coal tar-based food dye found in orange squash, orange jelly, marzipan, Swiss roll, apricot jam, citrus marmalade, lemon curd, fortune cookies, sweets, hot chocolate mix and packet soups, trifle mix, breadcrumbs and cheese sauce mix and soft drinks. It is the color most prominently seen in DayQuil. It is capable of causing allergic reactions such as abdominal pain, hyperactivity, hives, nasal congestion, and bronchoconstriction, as well as kidney tumours, chromosomal damage, and distaste for food.

Synthetic Food Colors

Natural Food Colors