1, the dried kelp bought in the market is very dry. Normally, it takes warm water to soak for two hours before it becomes soft and processed. However, to quickly soak dried kelp, it is necessary to add white vinegar without boiling water.

2. The reason for adding white vinegar is that white vinegar can react with kelp. White vinegar is acidic and can quickly soften kelp containing a lot of salt. In fact, the protective substance on the surface of kelp is destroyed, and water enters the interior of dried kelp more quickly, which accelerates the foaming process.

3, with hot water, kelp softens faster in hot water, especially in boiling water. Therefore, adding white vinegar will only accelerate the process of soaking hair. If it is put into boiling water, it will take two minutes to soak hair without stopping heating.