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There are obvious differences in surface characteristics, smell and touch between washed walnuts and unwashed walnuts:
Surface characteristics: The surface of walnuts soaked in liquid medicine is relatively smooth, lighter in color, and may have white spots, while the surface of unsoaked walnuts usually has black spots, with obvious unevenness, and is mostly dark brown or yellow in color.
Smell and touch: The surface of walnuts soaked in liquid medicine has an obvious liquid smell, which is unpleasant and pungent, while the surface of unsoaked walnuts has a natural woody aroma.
If powder falls off when the surface of the walnut is gently rubbed, it may have been soaked in potion.
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