Had to Go to a Bomb Shelter Right After I Poured My Wine for Kiddush

Question

I was about to make Kiddush when sirens suddenly went off. My entire family, myself included, immediately ran to the bomb shelter and remained there for approximately 40 minutes. We had left our phones behind before Shabbos, and only after receiving an alert that it was safe to leave were we able to return home. When I came back, I noticed that the wine I had poured for Kiddush had remained uncovered the entire time. I learned that wine which is left uncovered can be invalid for Kiddush. Was I still permitted to make Kiddush on this wine?

Answer

Practically speaking, it is permitted to make Kiddush on this wine. Wine that has been left uncovered becomes invalid for Kiddush only if it has deteriorated to the point that its taste or smell has changed and it is no longer considered fit or enjoyable for use. Leaving wine uncovered for approximately 40 minutes does not cause such deterioration. The Poskim note that, under normal conditions, wine would generally need to remain uncovered for at least three to four hours before there is concern that it may spoil. With modern wines, which contain preservatives, this process takes even longer. Therefore, since the wine remained uncovered for a relatively short period and showed no change in taste or aroma, it remains valid for Kiddush.

Scientific Explanation: How Long Does Wine Take to Spoil?

From a scientific standpoint, wine spoils mainly through oxidation and microbial activity, both of which occur slowly, especially in modern wines. Most commercially produced wines contain preservatives such as sulfites (sulfur dioxide), which significantly slow oxidation and inhibit the growth of bacteria and yeast. When wine is briefly left uncovered, oxygen does begin to interact with it, but this process is gradual and typically requires several hours before any noticeable change in taste or aroma occurs. Short exposures—such as 30 to 60 minutes—are comparable to the normal air contact wine experiences when poured into a glass and do not cause spoilage. In practical terms, wine with sulfites kept at room temperature generally needs many hours, or even a full day, of continuous exposure before becoming flat, sour, or otherwise unpleasant, meaning that a short period uncovered does not affect its quality or suitability for use.

Sources:

See Admur 272:1 that momentary openness does not disqualify the wine; Michaber 272:1; Bava Basra 97a; Ketzos Hashulchan 46 footnote 2; Beis Yehuda 53; Chayeh Adam 6:7; Minchas Shabbos 77:18; Ben Ish Chaiy Bereishis 2:25; Aruch Hashulchan 272:5; Divrei Malkiel 4:1 that 20 minutes is a short time and it takes 5-6 hours long for the wine’s taste to dissipate; Kaf Hachaim 272:7; Piskeiy Teshuvos 272:2; Az Nidbaru 1:7; Piskeiy Teshuvos 272:2