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Appearance of Thomson peel samples: (a) sun drying; (b) shade drying; (c) oven drying 45°C; (d) oven drying 60°C; (e) vacuum oven drying 45°C; (f) vacuum oven drying 60°C; (g) microwave drying 360 W; (h) microwave drying 600 W; (i) freeze‐drying and (j) fresh
