Special care is needed
Wild yeast is attached to the grape skins and should not be washed too much or washed with detergent.
When using a juicer to squeeze the grapes, be sure to squeeze the grapes slowly to avoid crushing the seeds and ruining the flavor of the wine. If you do not have a juicer, crush the grapes and remove the seeds.
Alcohol needs to be fermented in anaerobic conditions, so the bottles need to be sealed.
Yeast respiration produces carbon dioxide, so it is necessary to open the bottle every 12 hours (depending on the ambient temperature) to vent the air when a lot of air bubbles are generated in the bottle. But do not open the cap of the bottle. Yeast needs oxygen to multiply, but it is also necessary to prevent anaerobic respiration from producing large amounts of carbon dioxide, which can cause the fermentation bottle to burst.
When environmental conditions are favorable, yeast can reproduce asexually and increase its population rapidly. Sexual reproduction occurs when environmental conditions are poor.
