Reference for Chullin 194:31

כי משערינן בדידיה משערינן או במאי דנפק מיניה משערינן

R'Ashi said: When we were at R'Kahana's the question was put before us: When measuring, should one measure [the prohibited substance] itself or only the essence which exuded from it?<span class="x" onmousemove="('comment',' For the actual forbidden substance has now been removed from the pot, and the question is only with regard to the essence that exuded from it.');">¹⁸</span>

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