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Bicolored apple is a popular definition in the horticultural branch referring to apples characterized by a non-uniform skin color. Main cultivations are produced in Europe. The varieties considered to be bicolored include Gala, Champion, Idared, Ligol, Jonagored, Najdared and Gloster.
Color and sourness
Apple color depends on many factors, which include weather conditions at the time of fruit ripening, temperature fluctuations between the day and night cycles, good insolation, and the soil composition.
Bicolored apples that grow in certain regions of Europe, such as Grójec, are also characterized by a slight note of sourness, which results from the specific weather conditions, namely the ground frost occurring in that area during the autumn crop collection.
References
Bicolored apple Wikipedia(Text) CC BY-SA