It's moldy and deteriorated. Dried prunes soaked in white indicate that dried prunes have gone moldy and deteriorated. White is the mycelium formed by mold, so it can't be eaten, so as not to cause gastrointestinal diseases and endanger human health. Dried prunes are common ingredients in daily life. The normal color is black, yellow, dark green or brown, and there will be no white substance on them. There is a layer of white substance in dried prunes, which is generally considered to be inedible because the storage method is incorrect or the storage time is too long, which leads to mildew and deterioration.