The fermentation power comes from wild yeast on grape skin, and the addition of liquor will inhibit the function of yeast and affect the start of fermentation.

If liquor is added in the fermentation process, the taste of the wine will change and the taste of the final product will also be affected.

Liquid is usually used to scrub containers or tools to prevent contamination by miscellaneous bacteria. It is very important to keep the container clean during fermentation.