Oropharma Yel-Lux is a natural yellow colorant based on luteine.  This dietary supplement intensifies the yellow colour of the plumage and increases the resistance.  When Yel-Lux is added to the food it is transported to the place where the feather is growing and it takes on the more intense yellow colour.  INDICATION OF USE: 1 even tablespoonful (= 1 g) per 100 g Orlux eggfood. Yel-Lux must be administered via the food and never via the drinking water. In the breeding season: daily, beginning two weeks before laying the first egg. During moulting period: daily, the whole exhibition season round.