Related על תרומות 8:4

One who takes terumah from a [wine] tank and finds it uncovered, or a watermelon and finds it to have bite marks (Ter. 8:6), it is [valid] terumah, but he goes back and takes terumah [a second time, as the first terumah involved hazardous conditions]. [Apropos of wine,] Rabbi Yishmael son of Rabbi Yosei says in the name of his father, we take terumah from wine on behalf of vinegar, but we do not take terumah of vinegar on behalf of wine, except according to the proportion.