If it’s not white hair, it’s probably because the temperature is too high. The foam is probably produced by fermentation. It doesn’t matter. When I make kimchi and pickled sauerkraut, there’s foam. If you’re worried, just pour a little more liquid into it. Liquor will do.\x0d\\x0d\If you find a white film on the liquid surface, remove it immediately and add a small amount of shochu or fresh ginger slices, garlic, etc. to inhibit the growth of miscellaneous bacteria. \x0d\The white film on that side will have an unpleasant smell over time. First remove the white film, and then add some white wine to the jar. It is best to sprinkle the white wine evenly on top. The white film will disappear. If there are bamboo shoot shells, you can also put them in a jar to remove the white film. \x0d\\x0d\Follow-up question:\x0d\I have added white wine, but it doesn’t work. \x0d\ Answer: \x0d\ It must be that there is too much white film and you have not removed the excess white film. If it does not work, you can try the following methods. Take out all the pickles and wash the jar again. Discard the original salt water. Boil a pot of salt water again and let it cool before adding the pickles. Remember, the jar must be cleaned and dried.