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Qualitative assessment of skin damage via visual confirmation. Real-color pictures of synthetic skin samples at an initial temperature of 20 °C before and after their exposure to 20 s intervals of microwave heating at 2, 4, 5, 10, 15, and 20 W up to 120 s. Green frames denote no tissue damage at 2 and 4 W. Red frames denote tissue damage after 120 s of microwave heating at 5, 10, 15, and 20 W.
