Reference for Chullin 72:18

עשאוהו כהכשר מים מדרבנן

Shammai says, they are susceptible to uncleanness;<span class="x" onmousemove="('comment',' For the grapes have been moistened by the juice which oozed from them. Strictly this juice should not render anything susceptible to uncleanness, for the owner had no desire nor did he look forward with eagerness for it; Shammai, however, as a precautionary measure, puts this case on a par with the case where the juice was acceptable to the owner, when it is agreed by all that the juice would certainly render food suscept1ble to uncleanness.');">⁵</span>

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