Two Types of Sunburn in Apple Caused by High Fruit Surface (Peel) Temperature

Fig. 3B. The use of black patch method to induce sunburn in Gala apples. Apple on the left photo was heated to 126°F and apple on the right was heated to 122°F for 10 min. Photos A, B, and C were taken 1, 4, and 7 days after heating.



Image from Plant Health Progress article:
Two Types of Sunburn in Apple Caused by High Fruit Surface (Peel) Temperature