Mesorat%20hashas for Niddah 4:44

כל הטהרות שנעשו על גביו למפרע בין בר"ה בין ברה"י טמאות

and after that it is doubtful.<span class="x" onmousemove="('comment',' Tosef. Ter. IV. The meaning according to R. Johanan (B.B. 96a) is that during the first three days after the test the contents of the jug are regarded as 'certain' wine because in less than three days wine cannot turn into vinegar. Even if it be assumed that it began to turn sour immediately after the test it could not be called 'vinegar' until full three days had elapsed. The terumah given within these three days must inevitably have been wine and consequently have exempted the wine in the other jugs. After three days the contents are regarded as 'doubtful wine' since it is possible that the wine began to deteriorate only three days before it was found to be vinegar, into which it may have turned just at that moment. As the terumah is accordingly of a doubtful nature another portion must be set aside for the purpose. The meaning according to R. Joshua b. Levi (ibid.) is that during the last three days prior to the discovery that it had turned into vinegar, it is regarded as 'certain' vinegar because, in his opinion, the contents are deemed to be vinegar as soon as the wine begins to deteriorate in odour though its taste may still be that of wine. Since it is now proper vinegar the deterioration must have commenced at least three days earlier. Prior to the three days it is regarded as 'doubtful' because it is unknown when the deterioration had set in. ');">⁴¹</span>

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