Gardenia is a plant cultivated in China and Taiwan. In China, its fruit is used as ethnomedicine with anti-inflammatory and diuretic properties and as a colorant for foods. Extract from Gardenia gives ‘Gardenia Yellow’, whereas ‘Gardenia Blue’ is obtained by β-glucosidase reacting to proteins in the mixture of iridoid glycosides. Gardenia Blue has excellent heat and light stability. It is primarily used in combination with yellow colorants to make green coloring for foods.