It is orange yellow to lemon yellow in color. It is a synthetic lemon yellow azo dye. The breast is grey and the belly is lemon yellow. The flesh is firm, lemon yellow in color and scarcely fibrous. The leaves turn a lemon yellow in the fall. The color lemon yellow is shown at right. One was lemon yellow and the other coppery gold. The lower part of the abdomen is lemon yellow. The specific "citreola" is Latin for "lemon yellow". The name "Limonka" is referred to its lemon yellow colour. Plates continue to consist of black characters on a lemon yellow background, with reflective sheeting. Tartrazine is a synthetic lemon yellow azo dye primarily used as a food coloring. Uranium is used as a colorant in uranium glass, producing lemon yellow to green colors. The forewings are pale lemon yellow, overcast with bright ochreous red. "Lemon yellow" was a Crayola color from 1949 to 1990.