Chlorophyll / Chlorophyllin
Chlorophyll is extracted from plants — typically fescue and alfalfa — and then chemically modified (or stabilized), displacing the magnesium from the core of the molecule and substituting it with copper. The resulting stable, water soluble colouring is called sodium copper chlorophyllin. Copper chlorophyllin is permitted as a food colouring in the European Union; however, in the USA, its food use is limited to dry citrus beverages.
D.D. Williamson is a leading supplier of natural colourings, natural flavors and caramel colors for the food and beverage industry. They developed the natural flavor line for the markets demand for clean labels. D.D. Williamson's flavours may be labeled as “Natural Flavor” in North America and “Natural Flavouring” in Europe and can be labeled “colouring foodstuffs” (no E numbers) in Europe.