Homemade wine due to the environment, brewing tools, brewing process and other constraints, it will lead to the emergence of hazardous substances in the homemade wine, the quality of the grapes is not good pesticide hazards, the fermentation process nourishes molds, storage containers lead to toxicity, the ratio of the portion of brewing materials lead to unhealthy, homemade hygiene issues The problem is that it is not a good thing to have a homebrewer.
When we think of grapes as being produced from an orchard, it is likely that the grapes have been given pesticides during the growing process (in order to increase the yield!), and during the process of making homemade wine, we have been given the opportunity to use pesticides. The winemaking process does not promote washing the grapes clean, because it also relies on the microorganisms on the surface of the grapes to guide the fermentation process.
Mold and mildew
Grapes used to make wine need to be ripe, unbroken, and free of signs of mold and mildew. Grapes are not easy to keep at room temperature and are susceptible to mold and mildew, and if they are not fresh, they will make it easier for mold to grow in the wine. Therefore, the process of homebrewing wine must use fresh grapes, do not buy the grapes home to store a few days before starting to brew wine.