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Versele-Laga Oropharma Can-Tax is a red colourant based on canthaxanthine. It colours red canaries, intensifies the red colour in other birds and ensures a beautiful even red colour. As feathers consist of dead cells and are consequently not fed by the metabolism, they absorb the colour when they are formed. On average, the plumage is changed once a year, however not in one go. Red Feather Colourant Based on Canthaxanthine Colours Red Canaries Intensifies the Red Colour in Other Birds Ensures a Beautiful Even Red Colour IngredientsCanthaxanthine, Beta-apo-8'-carotenal, Vitamin E, E 124, Iron oxide, BHT