Retaining or modifying natural colour by use of additives, e.g. optical brighteners (A23L5/42 takes precedence)

Full Title

Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor > Colouring or decolouring of foods > Retaining or modifying natural colour by use of additives, e.g. optical brighteners (A23L5/42 takes precedence)