Artificial colorants, i.e. those commonly referred to as "coal tar dyes" or "food dyes", have for many years been ideal for replacing natural colorant destroyed during food processing, reducing colour variations in product batches and providing consumers appeal. However in recent years the number of dyes suitable for food use has been drastically reduced as a result of toxicological studies and, in Europe, by harmonization of European Community legislation. In addition there as been consumer pressure via major supermarket chains for more natural food products incorporating natural ingredients