Question 1: what's the matter with wine souring?
Maybe it's contaminated with Acetobacter. Many people find that home-made wine will turn sour at the end of drinking. Why? Experts say this is because of improper storage, the production of acetic acid bacteria, a microorganism that contaminates wine. For this kind of sour wine, it is recommended not to drink any more.
Question 2: will home brewed wine exceed the standard of methanol?
Temperature control is the key. There has been an accident of home-made wine before. Some people have said that the methanol of home-made wine may exceed the standard. Experts say that it is important to keep a good process.
Experts said that the grape contains pectin, pectin will produce methanol under the action of pectinase, and the high temperature will aggravate the production of methanol. The national standard requires that the methanol content in red wine shall not exceed 400mg / L, and that in white wine shall not exceed 250mg / L.
To avoid excessive methanol, the temperature must be controlled within 30 ℃, and Saccharomyces cerevisiae should be used at the same time, because the use of yeast can accelerate fermentation and inhibit the growth of harmful microorganisms. At the same time, strengthen the management of leather slag, and stir the leather slag every day to prevent its corruption. It is suggested not to make sweet wine, because the temperature in the fermentation process of home brewed wine is uncontrollable. Under the influence of wine storage environment, sweet wine is easy to corrupt, thus increasing the risk of methanol exceeding the standard.
Question three: how should wine be drunk?
Look, smell and taste. The right way to drink wine is: first, tilt the glass 45 degrees to see if the top of the wine is clear. Second, smell whether the aroma of wine is elegant. Shake it to make more aroma come out. Three taste, sip a sip of grape wine, feel its taste. What's the difference between white wine and red wine?
Question 4: what is the difference between white wine and red wine?
It is very important to brew with skin. The wine sold on the market is divided into red wine and white wine. Experts say it is mainly determined by grape varieties. Red wine is made from red grape varieties and white wine is mainly made from white grape varieties. Red wine is fermented with skin and flesh, the color of wine shows the color of grape skin, while white wine is to separate the flesh and skin, and only use the flesh for brewing. In addition, there is a kind of peach red wine, in which the pulp and peel of the grape are first soaked overnight, and then the peel is separated.