Processing method: After removing the long hair, do not shake to remove the upper layer of wine! Then observe for 2 days. If mold does not continue, you can continue fermentation. If mold occurs again, add live yeast.

Causes of hairy wine:

1. The wine-making method is wrong. During the wine-making process, the contact area between home-brew wine and air is too large for bacteria to breed, leading to mold. The most likely reason is that the wine was exposed to the air over a large area during filtration.

2. The brewing container used is not clean. Before the home-brewed wine is brewed, the wine-making container has not been cleaned, and there may be oil stains or dirt, which will eventually lead to the growth of bacteria and the growth of hair in the wine.

3. The grapes are not fermented at all, and the sugar content is too high, causing mold. The treatment method is to add live yeast.

Moldy is a common natural phenomenon. For example, food will become moldy if it is stored for a long time. In humid environments, we often see the phenomenon of 'hair growth'. Mold is actually a microorganism called "mold" growing on it. Mold and insect eggs require the presence of water and suitable temperatures for growth and development. If the water activity value is low, mold and insect eggs cannot absorb water. When the water activity value increases after getting damp, mold and insect eggs will absorb the water in the food and then decompose and eat the nutrients in the food.

Fermentation process:

Since home-brew wine will produce carbon dioxide (CO2) gas during the fermentation process, to prevent explosions, steel and food-grade plastic containers should be preferred, preferably Choose a container with a wide mouth and don’t overfill it with grapes. It is strictly forbidden to seal the container during fermentation. Leave a gap at the mouth of the bottle or seal it with eight layers of gauze. After fermentation, the wine and yeast should be completely separated to prevent the bottle from swelling during storage.

Extended information:

Notes on making wine:

1. The raw material grapes must be of high quality

Grapes are divided into wine grapes and fresh food grapes Grapes, in order to improve the quality of home-brewed wine, it is recommended that consumers try to buy fresh, mature, and undamaged wine grapes when purchasing raw materials.

2. Strictly prevent bacterial contamination

Fermentation equipment for home-brew wine should be cleaned, disinfected and drained with hot water or high-grade edible alcohol before use; the temperature during fermentation should be controlled at 15~ Between 25°C and 30°C; since there are many types of microorganisms on the skin of grape raw materials, it is recommended to add an appropriate amount of active dry yeast for winemaking before fermentation to inhibit the reproduction of miscellaneous bacteria. It is strictly prohibited to add water to the fermentation container during fermentation. If white hairs, mold spots and other foreign matter appear during fermentation or storage, it means that the product has been infected with miscellaneous bacteria and please do not drink it.

3. Home-brew wine is suitable for storage in a dark and cool environment

Subject to sterilization conditions, there may be other microorganisms in the wine after fermentation, which can easily lead to Wine goes bad. Therefore, it is recommended that home-brewed wine be stored in a dark, cool environment with a stable storage temperature between 10-15°C. Do not use non-food grade plastic bottles to store brewed wine. It is recommended to drink it within a short period of time and do not store it for a long time.

4. Judging whether it has deteriorated by color and smell

High-quality wine should be clear and transparent, with a natural and pleasing color; the aroma should be elegant and pleasant; the wine should be full and complete, with a sense of layering and structure feel. When a clear and stable home-brewed wine becomes turbid, loses its luster, or appears oily or rainbow-colored, and smells of acetic acid, nail polish, musty, mouse or other undesirable flavors, it can be basically judged that the wine has deteriorated. It is not suitable to drink anymore.

Reference: People's Daily Online - Remember these points and you can make good wine